The following should be direct substitutions. 12AX7 replace 7025 (the industrial name). It kinda dependsyes Ecc83/7025/12ax7/12ax7a are different designations (euro/industrual/US) for twin triodes with a gain multiplier of 100. 12ax7 vs 12ax7a: adam79: 12/2/10 10:42 PM: Is the 12ax7a the predecessor to the 7025 tube? A lower noise tube? I found a 12ax7a that I think is a Mullard, but I'm not 100% sure. GE NOS LONG PLATE 12AX7 NOS $45. Preamplifying tubes. My favourites are still the Telefunken types and the large plate Philips and Siemens types from the 50s. 12AX7 / ECC83 / 7025 tubes. Sign in to follow this. Die ECC83 (amerikanische Bezeichnung: 12AX7) ist eine Elektronenröhre (Doppel-Triode), die vorwiegend für Niederfrequenz-Anwendungen konzipiert wurde. The 7025 valve is a low hum and low noise version of the ECC83, but whether you’ll hear the difference is debatable. 호환관이라고 했는데 6681은 12ax7하고 동일합니다. Any good GE or RCA 12AX7A or 7025 should give you nice, fat tone. The tonal characteristics were a bit different too but not sure if. ) typically reduces circuit gain by 28% and slightly increases BW by 4%. Followers 0. Thus, substituting a 5751 for a 12AX7 (or ECC83, 7025, etc. 12AX7 (also ECC83, 7025) High gain preamplifier tube with ultra low noise and detailed, musical tone. This is a long plate valve so has a very rich tone. The standard is VERY high quality/. 70 each) Northern Electric 12AX7 (most expensive $58 each) Most of these tubes are more expensive than the Tung-Sol's, Mullard RI's and JJ's, but you get what you pay for. Is a 7025 a drop-in replacement for an ecc83? "A note on the 5751: Sometimes a 5751 can be used in lieu of a 12AX7. It utilizes a medium length ribbed plate design that is much like the old Amperex and Brimar European designs. Modern 12AX7 tubes are especially made for low noise high gain application, so any current production 12AX7 tubes can be used where 7025 is called for. Beautiful tubes ECC83 is the british name for a 12AX7. Note that matched pairs of 12AX7 are not required for guitar amplifiers. 12AX7 TUNGSRAM HUNGARY (these typically have very low noise and are under-rated 12AX7's, copper grid posts) TO BUY 12AX7 Tungsram. Really just depends on the tube and more importantly the tube compared to what you have currently. The new Sovtek 12ax7LPS is supposed to be the modern equivalent of the 7025. It hits the numbers pretty well for a new production valve. It has same specs as 12AX7A / ECC83 / 7025 but with different pinout for Pin 2+3 and 6-8 (see data sheet). Re: 12AX7 vs. Another factor on those lower gain tubes, especially the 12at7, used widely as a reverb or other driver, it pulls a lot more current which may not be good for the circuit / components (PT) as designed. The ECC83 Gallery 12AX7 E83CC 7025 ECC803S : 5751 CV4004 CV492 B339. Please try your search again later. Re: Fender preamp tubes 7025 vs 12AX7 Right, in the 50ies those 7025 had a different heater/cathode design, later on the 7025 was simply a selected and tested item. The TAD™ 7025 Highgrade is a miniature, high-mu twin triode for the most demanding amp stages. TAD 7025-S Highgrade, very rich tube for V1 in most of. They are interchangeable, though the 5751 has a gain rating that's less than the 12AX7. Shop our great selection of 12AX7, 12AX7A, 12AX7EA, 7025, ECC83, ECC803S, 5751 (low gain), CV492, 7058, 12DF7, CV4004, B339, E83CC, M8137vacuum tubes now. 7025 * * * * The 7025 has a higher gain than a 12AX7 tube. 7025's were specially designed to have low hum and noise characteristics and is the choice among many Hi-Fi types. Price: $40. It utilizes a medium length ribbed plate design that is much like the old Amperex and Brimar European designs. In the old days when not all 12AX7 were equal, low noise 12AX7 was given a different type code - 7025. Unique spiral filament eliminates filament to cathode induced hum common on amplifiers that use AC on the filaments. 12AX7A Author: RCA Subject: FP-2012-01-14 Created Date: 1/14/2012 1:36:06 PM. See our Best 12AX7 Review for more information. So much in fact that a lot of 12AX7A's were labeled 7025's (a very quiet version of the 12AX7). A 7025 is a low noise version of the 12AX7, originally developed for the military. It's also more heavy duty so it can take a beating. We carry all of the major brands in NOS, vintage and New Production vacuum tubes. The Europeans had this too and called this specials designs E83CC (simply a mix of the number and capitals). Note that matched pairs of 12AX7 are not required for guitar amplifiers. It is the Sovtek 12AX7LPS. JJ 12AX7 / ECC83S / 7025 Gold Pins. 같은 관에 12ax7, 7025 모두 각인된 경우도 많구요. Hello all, I was wondering about your opinions on the 12AX7-type preamp tubes. They are interchangeable, though the 5751 has a gain rating that's less than the 12AX7. By Sylvania. It was released for public sale under the 12AX7 identifier on September 15, 1947. I typically use Tung Sols in the first preamp stage because they have a warm sound. 5751s fly just a little under the radar and so you can get good ones at a better price. 9 out of 5 stars 10. The 12AX7-B does in fact have more g ain and lower noise than it's counterpart, and the Tung-Sol is a well rounded, bright and gainy tube, just don't use more than 1 in your amp. The gain is the same. The 7025 was originally selected as a very low noise tube of 'hi-fi' quality. Usage in Models. A 12AT7 is a lower gain tube from a 12AX7/7025/ECC83. Sign in to follow this. 12ax7 Fender. Sélection et tests maison rigoureux pour fournir le meilleur de ce tube moderne qui sonnera en V2 V3 (Mesa Boogie, Fender) associé en cocktail avec d'autres tubes NOS ou modernes. Great for warm clean tones and creamy overdrive. The tubes have well balanced triode pairs and a very even flat response. 12AX7のローノイズ版7025。ブラックフェースFenderアンプでは初段は7025の指定だった。Sovtekの7025はノイズも少なく癖のない音質で繊細な音色で使い易いが壊れ易い印象がある。 Sovtek 12AX7-LPS. The plate voltage is around 100 volts vs the RCA that operates at 200+ volts in other gear. RCA 12AX7: This is a 7025 alternative that delivers less efficient transfers of power but boasts greater noise reduction capabilities. By Sylvania. Tube Depot carries a selection of 12AX7 / ECC83 / 7025 / CV4004 Pre Amp Vacuum Tubes. Besondere, auf die Anwendung als Audioverstärker ausgerichtete Merkmale sind ihr geringes. 7025/ECC83 equivalent Have a question? Find answers in product info, Q&As, reviews There was a problem completing your request. 얘하고 깨진 RCA 블랙플레이트가 제일 좋아하던 한쌍이었습니다. 12AX7 tube is the most common preamp tube today. 3vをかけると正常に動作します、ソケットの配線替えが必要です、 (6. La 12AX7 fue desarrollada para reemplazar al doble triodo de base octal 6SL7 para ser usada en. Usage in Models. Price = for a pair of 2 tubes! This CK-5755 is a double-triode made by Western Electric (USA) for Raytheon. It is also a crisper sounding tube. So do some of the Chinese 12AX7s. So that # became obsolete. 25 mA/V è il minimo richiesto per un tubo nuovo. This 7025 tube is regarded as the holy grail among the double-triode preamp valves. thanks for the reply but I wasn't inquiring about a 12ax7 compared to a 12au7 and it's mu of 20 versus 100, the 12ax7 will probably over drive the 7591s The 12av7 or 12aw7 with the mu is the 40s might work. 7025 경우도 같은건데 생산업체나 시기에 따라서 다르게 구분한 경우도 있습니다. Tung-Sol 12AX7 / ECC83. L'atelier est fermé "jusqu'à nouvel ordre". I have a few Tube preamps, one of which is a Cary Audio CAD-5500S. En réalité, ce sont des lampes qui ont des caractéristiques quasi identiques. The V2A gain stage uses a 12AX7 triode with a 250V plate supply voltage, 100k plate load resistor and 1. It was developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522. The 7025 WA supports a fat midrange and creates a bold tone with lots of overtones. The 12AX7 Valve (or 12AX7 vacuum Tube) is a small preamplifier valve which is identical to the ECC83 - same valve, just a different name. Interchangable tubes: 12AX7 12AX7A ECC83 7025. Apr 5, 2015 - 12AX7 Amperex Bugleboy Valvo RCA 7025 BLKPLT Longplt 50's 60's Tubes Stay safe and healthy. Tra l' altro la valvola 6C10 per me era introvabile. The tonal characteristics were a bit different too but not sure if. My current scratch built amp is using old, used 12AX7 tubes, but I recently noticed Fender specifies 7025/12AX7A tubes in their later amps. " From the RCA spec. The 12AX7-B does in fact have more g ain and lower noise than it's counterpart, and the Tung-Sol is a well rounded, bright and gainy tube, just don't use more than 1 in your amp. Modern 12AX7 tubes are especially made for low noise high gain application, so any current production 12AX7 tubes can be used where 7025 is called for. TAD RT010 Tube 7025 Highgrade. 7025: Hifi low noise version of the 12AX7 with all other specifications being the same as 12AX7. Su ganancia es alta entre las ECC83/12AX7, suena radical en Marshalls clásicos y vibrante en Fenders, y aporta definición y detalle extra en preamps hi-gain. Order tubes BEFORE they need to be replaced, and save the gig. This is according to the RCA receiving tube manual. TAD 7025-S Highgrade, very rich tube for V1 in most of. Sie wurde 1948 von RCA entwickelt. TAD RT010 Tube 7025 Highgrade. 12ax7wa Amperex. I have a few Tube preamps, one of which is a Cary Audio CAD-5500S. Tra l' altro la valvola 6C10 per me era introvabile. 12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual triode - 6AV6 with high voltage gain. So that # became obsolete. 참고로, 제가 가진 12ax7 계열은 55년 ~ 69년입니다. ECC83/ 7025-HARMA DR270-Hi Gain Harma Valves A specially selected super gain version of the Harma ECC83/7025 for the guitarist who wants the maximum gain whist In stock £18. It was developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522. チューブアンプのプリ管12ax7を12at7に交換したらどういう現象がおこりますか? 12ax7の増幅率は100μ有ります。以下は互換可能なプリ管です。7025(12ax7のローノイズ管)・・・100μ5751(12ax7の高信頼管、軍用管)・・・70μ12at7. There are different tonal characteristics from each tube. It utilizes a medium length ribbed plate design that is much like the old Amperex and Brimar European designs. Many company's 7025s are simply 12AX7s that have been tested for low noise. The quietest 12AX7-family tube we have are pairs of NOS 1960's Philips Amperex organ grade production that apart of being dead quiet their sound is really great, smooth with deep bass with real authority and controlled, warm mids and highs and not overly sweet. The Westinghouse tall ribbed plate are poor. I tutaj pytanie jakie najlepsze lampy będą do moj. I have read that eventually the specs of the 7025 were adopted for 12AX7's, and that the 7025 nomenclature eventually dissapeared for new production in late 60's. For example a 12AX7 was available as 7025 (JAN/Military), ECC83 (England), CV4004 (France?), etc. Radio tubes are valves. Die Verbundröhre verfügt über zwei unabhängige und elektrisch identische Trioden-Systeme in einem Glaskolben. Now that said the original 12ax were long plates, then the Euro stuff like mullard and Phillips copied them. Salve possiedo un ampli fender super twin rewerb, e da voi ho acquistato tutte le valvole per fare un chek up totale (7025 WA tad hi,12at7,7025 S premium,6L6WGC-STR GE,6C10,6CX8). By this scoring, the best tube overall is the Electro-Harmonics 12AX7. 12AX7 is the US number. There are different tonal characteristics from each tube. Most SPICE model links are to Dave Cigna's stash of SPICE models provided by Francesco Piazza- these are marked DC. JCDenton6 wrote:Lots of guys use a Tung-Sol in V1 of their amps for a little more clarity, then go with Shuguang 12AX7-B in the rest of the positions to ramp up the gain and retain clarity if you play hard rock/metal. TAD ECC83-Cz (verified JJ ECC83S) in Marshall DSL50. Create your own unique tone and love your gear again!. So that # became obsolete. Fue comercializada al público con el nombre de 12AX7 el 15 de septiembre de 1947. Tube Interchangability Reference. Hladké, příjemné výšky, vynikající sustain. It hits the numbers pretty well for a new production valve. In my experience it really enriches the mid tones. Bien selectionnées ces lampes modernes sont très bien. Groove Tubes 7025 (black plate E! 12AX7): This tube is DA THING! The sexiest midrange I've ever heard, hope the new shiny plates are just as good. 12AX7 A built according to military regulations. The 12AT7 is used as a driver tube in many old Fender amps. The ECC83 MG is a "Mid Gain" 12AX7 type tube. An exact replacement. The 7025 valve is a low hum and low noise version of the ECC83, but whether you’ll hear the difference is debatable. For a comparison of all the 12AX7's we carry, click on the tech corner link at the top of this page. So do some of the Chinese 12AX7s. 5751) is identical over the tubes' operational ranges. This is according to the RCA receiving tube manual. 12AX7 tube is the most common preamp tube today. The TAD™ 7025 Highgrade is a miniature, high-mu twin triode for the most demanding amp stages. Electro-Harmonix has released a low noise, low microphonic version of the 12AX7 that meets all specifications required for the tube to be designated 7025. The tonal characteristics were a bit different too but not sure if that is a direct result of the tubes or the tubes interaction with the other circuitry. The 12AX7 is a high-gain (typical gain factor 100), low plate current triode, and is therefore best suited for use in the preamplifier (input and mid-level) stages of audio amplifiers, guitar amps , mic preamps etc. No microphonics issues at all. After the original 12AX7, additional variants were issued with various industrial numbers (including the 7025) as well the 12AX7A. My Favorite Tubes and Their Substitutes by Robert H. Beautiful tubes ECC83 is the british name for a 12AX7. As the title says is there really any physical difference between 12AX7, 12AX7A and 7025 tubes? I know that a 12AX7 tube is the original design, a 12AX7A tube is a lower noise version of the original 17AX7 and so is a 7025 tube, but are they really made differently?. You can use Google and check out lots of information 12AX7A vs. GE NOS LONG PLATE 12AX7 NOS $45. In fulfilling its stated purpose (reduced hum and noise), it was in direct competition with the 7025. Flying Leads Plug&Play CV4033 - Premium 12AT7 ECC81 E81CC ECC801S 6201 6060 CV455 CV4024 type. So a NOS 12AX7 with a suffix starting with 'W' is a military valve. I typically use Tung Sols in the first preamp stage because they have a warm sound. A Comparison of Current Production 12AX7 Tubes by Kurt Prange RCA and Sylvania first introduced the 12AX7 to the world in the late 1940's. The quietest 12AX7-family tube we have are pairs of NOS 1960's Philips Amperex organ grade production that apart of being dead quiet their sound is really great, smooth with deep bass with real authority and controlled, warm mids and highs and not overly sweet. 99: Buy Now: Result Pages: 1 2 Displaying 1 to 20 (of 39 products) Categories. It is especially suited for use in resistance-coupled voltage amplifiers, phase inverters, multivibrators, and numerous industrial-control circuits where high voltage gain is desired. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. JJ Electronic ECC83MG - 12AX7 Factory Data Sheet: ECC83MG Our observations: Another 12AX7 variant from JJ. 12ax7 vs 12AT7 vs 7025 etc. Peter Roggenhofer † 25. The only claimed changes are lowered hum, lowered noise and microphonics (in some sheets). Groove Tubes 7025 (black plate E! 12AX7): This tube is DA THING! The sexiest midrange I've ever heard, hope the new shiny plates are just as good. We will take a look at why you might, or might not want to swap out the different types of tubes. EH 12AX7, when nothing else works. Standard Delivery Times. The purpose of this comparison is simply to provide guitar players with a frame of reference to help in finding the best current production 12AX7 for their needs. New Gain Tested Tung-Sol 12AX7 / ECC803S GOLD PINS Vacuum Tube. Salve possiedo un ampli fender super twin rewerb, e da voi ho acquistato tutte le valvole per fare un chek up totale (7025 WA tad hi,12at7,7025 S premium,6L6WGC-STR GE,6C10,6CX8). It's just that an NOS 12AX7A tube is considered to be premium over the 12AX7. 12AX7 ECC83; 12AX7 ECC83. The gain is the same. New Old Stock. This is a long plate valve so has a very rich tone. ( 一 )GE 12AX7/7025 :是 70 年代產品,音色平衡度不錯,若不與特殊高班的膽比較,它仍勝過很多現今新造的同價膽。 ( 二 )Raytheon JAN CRP-5751 :一向 Raytheon 是製造軍用膽的機構,特性測試極嚴謹,質素有一定. Now that said the original 12ax were long plates, then the Euro stuff like mullard and Phillips copied them. EUR 69,00 +EUR 8,45 spedizione; 1x 12ax7a = 5751 ecc83 USA NOS Tube Tubo Valvola. Changing tubes in an amp can be a particularly challenging experience, especially since there seems to be such an abundance of them. L'atelier est fermé "jusqu'à nouvel ordre". Price: $40. A 12AT7 is a lower gain tube from a 12AX7/7025/ECC83. Rock Icon: Joined: Tue Jun 29, 2010 1:20 pm Posts: 9638 Location: Indiana Frankly, there is a bit of romanticizing about the "better" older tubes, NOS or not. Following on from Matt Lachesky's article 'Mullard ECC83 (12AX7) Reissue vs Original - A Physical Comparison' in which he performed a dissection of a 'Reissue' New Sensor Mullard 12AX7 (American for ECC83) and an authentic Mullard Blackburn ECC83 tube, I decided to undertake some additional electrical performance measurements of these two tubes to supplement his findings. For the price, this tube has the cleanest high end of any of the similarly priced modern 12AX7. The ECC83 Gallery 12AX7 E83CC 7025 ECC803S : 5751 CV4004 CV492 B339. New & NOS tubes from Tung-Sol, Electro-Harmonix, JJ & more!. I compared this tube against an old EI and Telefunken smooth plate and there was very little difference. Salve possiedo un ampli fender super twin rewerb, e da voi ho acquistato tutte le valvole per fare un chek up totale (7025 WA tad hi,12at7,7025 S premium,6L6WGC-STR GE,6C10,6CX8). TAD 7025-S Highgrade, very rich tube for V1 in most of. New Ruby Tubes 7025's in stock. The tonal characteristics were easier to hear. The 7025 is a low noise version of the 12AX7A. Both of these were lower noise versions of the 12AX7. Soft highs and dominant mids help emphasize the amp's original sound. The gain is the same. Standard Delivery Times. The Mullard 12AX7 Preamp Tube delivers a large sound stage with excellent detail. pair All have tested very strong,without gas shorts or leaks! I love a good complex mid range sounding tube so to best hear all the musical instruments!. The Lorenz ECC83s sound very nice, too. I run 5751s in my 12AX7 slot and can hardly discern less volume. The 12AX7 was made for quite a while. Also included in this comparison are direct substitutes for the 12AX7 including: ECC83, ECC803, 7025 and 5751. The only claimed changes are lowered hum, lowered noise and microphonics (in some sheets). 5751s fly just a little under the radar and so you can get good ones at a better price. The 12AX7, 12AT7, and 12AU7 all belong to the same family of nine contact, twin triode tubes. 같은 관에 12ax7, 7025 모두 각인된 경우도 많구요. These days, the designation "7025" is just a buzz word. Original equipment in '60s Fender guitar amps. I have not tried 7025 Long. The new Sovtek 12ax7LPS is supposed to be the modern equivalent of the 7025. So the bottom line is that you can use either of these tubes in your Marshall amp. "The Type 7025 is identical to the 12AX7 except for improved noise and hum characteristics. JJ 12AX7 / ECC83S / 7025 Gold Pins. The best for THD is the Sino 12AX7, but wow does that filament glow bright for a second or so after switch on! If you want gain, go for a Sovtek 12AX7LPS or a Mullard 12AX7; For lowest microphonics, Tung Sol 12AX7. Create your own unique tone and love your gear again!. The new TAD 7025S is a faithful reproduction of the legendary original Mullard ECC83 valve which was made in England till the late 1960s. The reissue Genalex Gold Lion ECC83 / B759 tube is New Sensor's modern-day effort to recreate the renowned sound signature of the vintage European original. These tubes are high gain, low noise, and are VERY warm and detailed. Phenomenal Valvo or Siemens Halske ECC83 12AX7 "LONG PLATES" 1950's "D-FOIL-GETTER" NOS SINGLE TUBE OR PAIR! Add 1967 NOS GE USA JAN 12AX7 WA 7025 MILITARY ECC803S DIGITAL BALANCED PERFECT TRIO. My question is this: what is the difference between the 12AX7 and the 7025?. The 7025 WA supports a fat midrange and creates a bold tone with lots of overtones. Many company's 7025s are simply 12AX7s that have been tested for low noise. As SD97 noted a 7025 was a military tube. Also, one need never use all one type of tube in a preamp (like all 7025, for example), nor do they need to be the same manufacturer's tubes. RCA 12AX7's seem to be very popular for electric guitar. It utilizes a medium length ribbed plate design that is much like the old Amperex and Brimar European designs. In fulfilling its stated purpose (reduced hum and noise), it was in direct competition with the 7025. Really just depends on the tube and more importantly the tube compared to what you have currently. A center-tapped heater permits operation of the tube. 5751s fly just a little under the radar and so you can get good ones at a better price. 진공관 찾으러 박스도 몇번 뒤지고, 친구네서 하나 얻어오고, 소리전자 중고장터에서 하나 샀습니다. Compared to the JJ ECC83-S this tube sounds a little more eager to hit the midrange. By Sylvania. Classic tube for all Fender and similar amps. The bunch I have is a little noisy, so I wouldn't mind paying the extra $$$ for microphonics and noise screening, this tube really rocks!. 12AX7のローノイズ版7025。ブラックフェースFenderアンプでは初段は7025の指定だった。Sovtekの7025はノイズも少なく癖のない音質で繊細な音色で使い易いが壊れ易い印象がある。 Sovtek 12AX7-LPS. This is not to say that all modern 12AX7's are the same they are not. 12AX7 / ECC83 / 7025 tubes. This is why vintage Fender tube chart calls for 7025. For use as 12AX7 an adaptor or an adjusted socket wiring for pin 2+3 and 6-8 is required. New & NOS tubes from Tung-Sol, Electro-Harmonix, JJ & more!. Sovtek 12AX7 WB / 7025 Cryo Matched Pair (2) $38. groove tubes stp-g - v2 = 12ax7 / 7025 vs 12ay7 Le Groove Tubes STP-G dont le son est très sympa, mais si ont déclenché le "Gain on" (qui ajoute en fait une étape tube / gain (principe de Boogie MK1)), je pense qu'il y a trop de gain!. A 12AT7 is a lower gain tube from a 12AX7/7025/ECC83. So do some of the Chinese 12AX7s. 7025: This is the low noise, "industrial" version of the 12AX7. The 12AX7 is also used in many audio preamps and in guitar effects pedals. Fue comercializada por Groove Tubes como "7025" (denominación industrial) en los tiempos de gran disposición de modelos, hasta que se agotó su stock. 7025は12ax7の工業番号で、グルーヴチューブのハイゲイン版ということです。 なぜ製造国不明かというと、グルーヴチューブは、各国の真空管の良いものを購入・選別し、自社のブランドを付けて販売しているためです。. Hello to all forum members. 12AX7 SVETLANA 2002 production Distributor selected 12AX7A-C RUBY SELECT new China production 12AX7 EH SOVTEK 2001 and 2002 production 12AX7 LPS SOVTEK 2000, 2001 & 2002 production 7025 HARMA We decided in the spirit of acting fair that the HARMA STR ECC83 which is a selected low noise drive tested version of the JJ/Tesla ECC83S and the HARMA. 6vですがヒーターの中点からリードが出ていてそれが9番ピンです、 4~5ピンを一緒に繋いで9番ピンとの間に6. There are many versions of the 12AX7 tube and many brands. ARS Electronics Since 1947 - Audio Catalog Page. Make Offer - Amperex BUGLE BOY 12AX7/ECC83 Round Getter/Grey Plates STRONG Tested Vacuum Tube RARE Amperex 12ax7 ECC83 Bugle Boy 6J Mc2 D-foil Getter 12ax7a 7025 10m Ecc803s $165. Most SPICE model links are to Dave Cigna's stash of SPICE models provided by Francesco Piazza- these are marked DC. The 12AX7 is a 9-pin miniature, high-mu, twin triode. RCA 12AX7: This is a 7025 alternative that delivers less efficient transfers of power but boasts greater noise reduction capabilities. The following should be direct substitutions. Following on from Matt Lachesky's article 'Mullard ECC83 (12AX7) Reissue vs Original - A Physical Comparison' in which he performed a dissection of a 'Reissue' New Sensor Mullard 12AX7 (American for ECC83) and an authentic Mullard Blackburn ECC83 tube, I decided to undertake some additional electrical performance measurements of these two tubes to supplement his findings. Original equipment in '60s Fender guitar amps. Compared to the JJ ECC83-S this tube sounds a little more eager to hit the midrange. Ale nawet nie wiem na jakim gnieździe gdzie jaka lampa powinna być. C'est la 12AX7 LPS Sovtek version compétition. Unique spiral filament eliminates filament to cathode induced hum common on amplifiers that use AC on the filaments. The 6N2P-EV, (Russian: 6?2?-??) is a miniature 9-pin dual triode vacuum tube manufactured in USSR , Russia and China with characteristics similar to the RCA 12AX7. Vacuum Tube - 7025-WA, Tube Amp Doctor, High-Grade, Premium Selected - The TAD 7025 WA delivers full gain with smooth top end. GE used/tested ANOS Long Plate 12AX7 (these sound great in Fender amps) $20. A Comparison of Current Production 12AX7 Tubes by Kurt Prange RCA and Sylvania first introduced the 12AX7 to the world in the late 1940's. New & NOS tubes from Tung-Sol, Electro-Harmonix, JJ & more!. Une fonction tenue par une 12ax7 peut-être tenue par une autre 12AX7, pas de souci. The 12AX7 is by far the best known preamp tube among guitar players. Following on from Matt Lachesky's article 'Mullard ECC83 (12AX7) Reissue vs Original - A Physical Comparison' in which he performed a dissection of a 'Reissue' New Sensor Mullard 12AX7 (American for ECC83) and an authentic Mullard Blackburn ECC83 tube, I decided to undertake some additional electrical performance measurements of these two tubes to supplement his findings. google "12ax7 vs 7025": get responses like: In the old days the 12AX7 and 7025 were different quality tubes. In Colby and Park amps, I use Tung Sol, Chinese, and JJ 12AX7 tubes, as well as the Sovtek 12AX7LPS. The 12AX7 was made for quite a while. Selected and recommended for guitar amps to improve overall response. 12AX7 (also ECC83, 7025) Preamp Vacuum Tube. 7025's were specially designed to have low hum and noise characteristics and is the choice among many Hi-Fi types. I think 12ax7 a just an OEM lable for the export products, maybe tempory label! And the 12ax7b is the newest product line with the better design. European code for 12AX7 high-gain twin-triode. 12AX7, 5751 and 7025 tube reviews by John Templeton. Problem is that most current tube distributors will use '12AX7', ECC83 & 7025 in their descriptions because they are interchangeable in the circuit. 12AX7, 7025, ECC83 - zamienniki i opinie Zaloguj się, aby obserwować tę zawarto Ja stosuję Electro-Harmonixy 12AX7 Gold Pin - wg mnie są rewelacyjne. I have not tried 7025 Long. The 5751 has identical plate resistance to the 12AX7, but the gain is 70 compared to 100 for the 12AX7. Preferred Series 7025 / 12AX7. The 12AT7 is used as a driver tube in many old Fender amps. 12AX7 TUNGSRAM HUNGARY (these typically have very low noise and are under-rated 12AX7's, copper grid posts) TO BUY 12AX7 Tungsram. To the best of my knowledge, the tubes with numbers only i. Co istotne, to "zwykłe" 12AX7 EH grają zupełnie inaczej - gorzej od tych na złotych nóżkach. The quietest 12AX7-family tube we have are pairs of NOS 1960's Philips Amperex organ grade production that apart of being dead quiet their sound is really great, smooth with deep bass with real authority and controlled, warm mids and highs and not overly sweet. It was developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522. in Western Europe and in the USA) there was no need for any of this crap. The original 7025 tube was a 12AX7 that was tested and selected for the lowest noise and microphonics for use in the critical first preamp stages of amplifiers where noise and microphonics. Classic tube for all Fender and similar amps. For use as 12AX7 an adaptor or an adjusted socket wiring for pin 2+3 and 6-8 is required. Bien selectionnées ces lampes modernes sont très bien. Ale nawet nie wiem na jakim gnieździe gdzie jaka lampa powinna być. Lots of gain with a rather low noise floor. MajorNut1967 New Member. 3vが6vでも問題はありません). If someone could take a look at it and tell me if The RCA 7025 was 12AX7 with a different. Epiphone Uptown Kat ES Ruby. Is a 7025 a drop-in replacement for an ecc83? "A note on the 5751: Sometimes a 5751 can be used in lieu of a 12AX7. ⑤ 7025 (差し替え〇) 強化されたマイカ,コイルヒーター,リードの最短配線,強化ステムなどにより耐振動性を確保した12ax7のローノイズ管。色付けのない音で個性には欠けるもののフォノeq,プリアンプに向いた球です。 ⑥その他. Soft highs and dominant mids help emphasize the amp's original sound. The Tube Store 7025 hummed big time (because of my amp, not the tube IMHO). DOUBLE TRIODE ECC83S is 12AX7 high gain pre-amplifying double triode. My current scratch built amp is using old, used 12AX7 tubes, but I recently noticed Fender specifies 7025/12AX7A tubes in their later amps. John Templeton / March 18, 2016. Similarly, substituting a 12AY7 for a 12AX7 reduces circuit gain by almost half (45%) but nearly doubles the BW. It was developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522. La 12AX7 o ECC83 es una válvula doble triodo de base noval B9A con un elevado grado de ganancia. The 7025 was originally selected as a very low noise tube of 'hi-fi' quality. RUSSIAN DOUBLE TRIODE TUBE 6N2P-EV. Vous pouvez installer plusieurs lampes différentes dans votre ampli à la place des 12AX7. It has same specs as 12AX7A / ECC83 / 7025 but with different pinout for Pin 2+3 and 6-8 (see data sheet). The 7025 was a more robust version of the 12AX7, often used in military applications (aircraft comm, radar, etc ). sovtek 12ax7waなら3年保証付のサウンドハウス!楽器・音響機器のネット通販最大手、全商品を安心の低価格にてご提供。送料・代引き手数料無料、サポート体制も万全。首都圏即日発送。ロシア製のスタンダードな真空管です。. Also included in this comparison are direct substitutes for the 12AX7 including: ECC83, ECC803, 7025 and 5751. 12ax7wa Arcturus. 12AX7 (also ECC83, 7025) High gain preamplifier tube with ultra low noise and detailed, musical tone. En réalité, ce sont des lampes qui ont des caractéristiques quasi identiques. The 7025 and 12AX7A data sheets both say: "For high-fidelity audio-amplifer applications critical as to noise and hum. JJ Electronic ECC83MG - 12AX7 Factory Data Sheet: ECC83MG Our observations: Another 12AX7 variant from JJ. If someone could take a look at it and tell me if The RCA 7025 was 12AX7 with a different. RCA made some good ones but I am getting ahead of myself. Great for warm clean tones and creamy overdrive. The 7025 is a low noise version of the 12AX7A. The heater current is slightly different, 175ma vs 150 for 12AX7(series heater operation) I tried a 5751 in a series string and it flared brightly while the 150ma tubes just set there a few seconds befor heating and equalizing the string. pair All have tested very strong,without gas shorts or leaks! I love a good complex mid range sounding tube so to best hear all the musical instruments!. Available immediately. To reiterate: 5751 is a lower gain sub for 12AX7, and 7025 is a low-noise 12AX7 (same spec). In the old days when not all 12AX7 were equal, low noise 12AX7 was given a different type code - 7025. It's a very common gain stage that's used in many amps. These tubes are high gain, low noise, and are VERY warm and detailed. Visit us now!. You can use Google and check out lots of information 12AX7A vs. Hello to all forum members. A modern 12AX7 with a W prefix means nothing in particular. It has a very full and musical sound signature. This amp looked brand new and still had all its original tubes. Some folks (guitar guys typically) that have gear that come equipped with 12AX7's will sub a 5751. Similarly, substituting a 12AY7 for a 12AX7 reduces circuit gain by almost half (45%) but nearly doubles the BW. Classic tube for all Fender and similar amps. Su ganancia es alta entre las ECC83/12AX7, suena radical en Marshalls clásicos y vibrante en Fenders, y aporta definición y detalle extra en preamps hi-gain. Factory pre-selected for closest tolerances and best performance. The 7025 WA supports a fat midrange and creates a bold tone with lots of overtones. Co istotne, to "zwykłe" 12AX7 EH grają zupełnie inaczej - gorzej od tych na złotych nóżkach. NOS in original boxes labeled as Motorolla and Truetone. Beautiful tubes ECC83 is the british name for a 12AX7. 5751 Sylvania. 12AX7のローノイズ版7025。ブラックフェースFenderアンプでは初段は7025の指定だった。Sovtekの7025はノイズも少なく癖のない音質で繊細な音色で使い易いが壊れ易い印象がある。 Sovtek 12AX7-LPS. Fue comercializada por Groove Tubes como "7025" (denominación industrial) en los tiempos de gran disposición de modelos, hasta que se agotó su stock. But the real cool tubes are the long plate types from the plant in Hamburg. The 7025 valve is a low hum and low noise version of the ECC83, but whether you’ll hear the difference is debatable. Note that the modern Sovtek 12AX7WC is actually a pretty good valve. Followers 0. the 7025 is supposed to be a premium version or quieter running 12ax7, but it is spec. Looking for ECC83, 7025 Tubes? You can use any current production 12AX7 tube as 12AX7A, ECC83 or 7025. The original 7025 tube was a 12AX7 that was tested and selected for the lowest noise and microphonics for use in the critical first preamp stages of amplifiers where noise and microphonics. 12ax7 vs 12AT7 vs 7025 etc. 7025 vs 12AX7A vs 12AX7. A modern tube marked "7025" is probably just a run of the mill 12AX7 or at best a 12AX7 that has been tested for noise and microphonics. 7025: This is the low noise, "industrial" version of the 12AX7. 12AX7 Tubes. 25 mA/V è il minimo richiesto per un tubo nuovo. All Product Information Customer Q&A's Customer Reviews Your question may be answered by sellers, manufacturers, or customers who purchased this item, who are all part of the Amazon. The quietest 12AX7-family tube we have are pairs of NOS 1960's Philips Amperex organ grade production that apart of being dead quiet their sound is really great, smooth with deep bass with real authority and controlled, warm mids and highs and not overly sweet. 12AX7のローノイズ版7025。ブラックフェースFenderアンプでは初段は7025の指定だった。Sovtekの7025はノイズも少なく癖のない音質で繊細な音色で使い易いが壊れ易い印象がある。 Sovtek 12AX7-LPS. Mesa Boogie Tube SPAX 12AX7. RCA 12AX7's seem to be very popular for electric guitar. It retains all of the definition and detail that the ECC83S short plate and the ECC803S long plate tubes have but it has. 5751: Military version/drop in replacement for the 12AX7, but is actually different. The JJ ECC83S / 12AX7 is perhaps the most consistently high gain of all 12AX7's. They are marked "COMPUTOR", and were made for mainframe computer arrays, back when computers took up whole rooms. A modern tube marked "7025" is probably just a run of the mill 12AX7 or at best a 12AX7 that has been tested for noise and microphonics. And while it's true they have gain curves that are 70% of a 12AX7/12AT7, that difference occurs mostly at THE TOP OF THE CURVE! Most of the curve for the two kinds of tube (12AX7 v. to ECC83, 12AX7, 7025) All of the 12AX7 types listed may be used to replace 7025 or 12AX7A. Fue comercializada al público con el nombre de 12AX7 el 15 de septiembre de 1947. チューブアンプのプリ管12ax7を12at7に交換したらどういう現象がおこりますか? 12ax7の増幅率は100μ有ります。以下は互換可能なプリ管です。7025(12ax7のローノイズ管)・・・100μ5751(12ax7の高信頼管、軍用管)・・・70μ12at7. 12AX7, 7025 and 5751 Tubes. Price: $40. Les références les plus connues sont la 7025 et la ECC83. The only claimed changes are lowered hum, lowered noise and microphonics (in some sheets). TV repairmen did quite well replacing tubes back in the day. It kinda dependsyes Ecc83/7025/12ax7/12ax7a are different designations (euro/industrual/US) for twin triodes with a gain multiplier of 100. This amp looked brand new and still had all its original tubes. Groove Tubes 7025 (black plate E! 12AX7): This tube is DA THING! The sexiest midrange I've ever heard, hope the new shiny plates are just as good. So much in fact that a lot of 12AX7A's were labeled 7025's (a very quiet version of the 12AX7). 12AX7 Tubes. By Sylvania. 6vですがヒーターの中点からリードが出ていてそれが9番ピンです、 4~5ピンを一緒に繋いで9番ピンとの間に6. The purpose of this comparison is simply to provide guitar players with a frame of reference to help in finding the best current production 12AX7 for their needs. Guitar amplifier parts, guitar amplifier tubes and guitar amp tubes 12ax7, 6v6gt, EL84. Review – Preferred Series 7025 / 12AX7 Tube March 18, 2016 Get The Stink Out – Removing Odor From Your Instrument March 11, 2016 Review – JJ ECC83-MG / 12AX7 March 10, 2016. A 7025 is a low noise version of the 12AX7, originally developed for the military. Low noise, and a smooth tone. Also included in this comparison are direct substitutes for the 12AX7 including ECC83, ECC803, 7025 and 5751. 12AX7A represented a small tweak (small) as did 12AX7B. TWIN TRIODE, 12AX7 datasheet, 12AX7 circuit, 12AX7 data sheet : GEC, alldatasheet, datasheet, Datasheet search site for Electronic Components and Semiconductors. Su ganancia es alta entre las ECC83/12AX7, suena radical en Marshalls clásicos y vibrante en Fenders, y aporta definición y detalle extra en preamps hi-gain. and 7025 is the industrial name. Neat - and only 9 pins. The Westinghouse tall ribbed plate are poor. These tubes are high gain, low noise, and are VERY warm and detailed. In other respects, the 7025 is similar to the 12AX7. The ECC83 Gallery 12AX7 E83CC ECC803S 7025 : 5751 CV4004 CV492 B339 : The ECC83 is still the most important preamp and driver tube. Thinning out + Selling off many vintage 12AX7 / 7025 / 5687 / ECC83 tubes + 12AU7 / ECC82 / 6189 / 5963 / 12AT7 / 6201 / ECC81 @ $35. ECC is a european designation, hence Marshall, from England came with ECC-83 pre-amp tubes, while Fender [american] came with 12AX7's, same tube, different designation. was the originally supplied tube to Fender in the 1950s if you want to be period-correct. But the real cool tubes are the long plate types from the plant in Hamburg. We need a mention the fourth member of the Sovtek 12AX7 family. Balance Tungsol Russia. pair All have tested very strong,without gas shorts or leaks! I love a good complex mid range sounding tube so to best hear all the musical instruments!. If this tube is still too "smooth" or mellow in your amp, I'd start looking at electrolytic bypass caps and main filter caps feeding these 12AX7. The bunch I have is a little noisy, so I wouldn't mind paying the extra $$$ for microphonics and noise screening, this tube really rocks!. Die ECC83 (amerikanische Bezeichnung: 12AX7) ist eine Elektronenröhre (Doppel-Triode), die vorwiegend für Niederfrequenz-Anwendungen konzipiert wurde. Sie wurde 1948 von RCA entwickelt. New Old Stock. Following on from Matt Lachesky's article 'Mullard ECC83 (12AX7) Reissue vs Original - A Physical Comparison' in which he performed a dissection of a 'Reissue' New Sensor Mullard 12AX7 (American for ECC83) and an authentic Mullard Blackburn ECC83 tube, I decided to undertake some additional electrical performance measurements of these two tubes to supplement his findings. I was hitting it with finger quite hard with no audible effects 🙂 Very smooth sound, not as smooth as RCA 12ax7 Long Gray Plates, but quite close. I have read that eventually the specs of the 7025 were adopted for 12AX7's, and that the 7025 nomenclature eventually dissapeared for new production in late 60's. All Product Information Customer Q&A's Customer Reviews Your question may be answered by sellers, manufacturers, or customers who purchased this item, who are all part of the Amazon. 12ax7 vs 12ax7a: adam79: 12/2/10 10:42 PM: Is the 12ax7a the predecessor to the 7025 tube? A lower noise tube? I found a 12ax7a that I think is a Mullard, but I'm not 100% sure. 0:00 gt12ax7m 2:30 ge7025 gt12ax7mは、マラードのコピーだそうです。 gtはギターアンプ用の真空管を販売する商社で、メーカーではありません。独自に. The tonal characteristics were a bit different too but not sure if that is a direct result of the tubes or the tubes interaction with the other circuitry. A lista de equivalência da válvula 12AX7 é bastante extensa e pode conter, além do código europeu ECC83, outros como ECC803, CV4004, M8137, 7025, 7025A e 6681, sendo a diferença entre estes tipos devida apenas a fabricantes diferentes ou versões com qualidade especial. Great for warm clean tones and creamy overdrive. Played clean the TAD 7025 WA delivers a warm liquid tone which is very responsive to dynamic playing. The 7025 has a coiled filament which is supposed to reduce hum in circuits using AC on the filaments. Posted: Mon Apr 28, 2014 4:39 am. Today's new production Tung-Sol tubes are constructed with the same commitment to quality and reliability. 12ax7 Fender. Unique spiral filament eliminates filament to cathode induced hum common on amplifiers that use AC on the filaments. As a result the El34's in the Laney example get a big final push from the pre-amp stages. The ECC83 / 12AX7 tubes in these premium matched pairs, trios, quads, and sextets were made in pre-war Yugoslavia and labeled for Audio Research Corporation. 7025 * * * * The 7025 has a higher gain than a 12AX7 tube. Some folks (guitar guys typically) that have gear that come equipped with 12AX7's will sub a 5751. Vacuum Tube - 7025-WA, Tube Amp Doctor, High-Grade, Premium Selected - The TAD 7025 WA delivers full gain with smooth top end. It's also more heavy duty so it can take a beating. When they discontinued the 'AX7 a couple of years later, the 'A was referred to as strictly an audio tube, and the 7025 (introduced at the same time as the 'A) became the upgrade of the 'A. I can't really offer much help on the new production tubes, but I do know my way around NOS tubes pretty good. NOS in original boxes labeled as Motorolla and Truetone. It was designed for use in high fidelity audio circuits. Dietrich Grötzer. My Favorite Tubes and Their Substitutes by Robert H. " From the RCA spec. My question is this: what is the difference between the 12AX7 and the 7025?. 12AX7 / ECC83 / 7025 tubes. I typically use Tung Sols in the first preamp stage because they have a warm sound. It is also a crisper sounding tube. Karel De Reus † #N#ECC83: Peter Roggenhofer. Electro-Harmonix 12AX7EH Preamp Tube The Electro-Harmonix 12AX7EH is a preamp tube that provides high gain with ultra low noise. 12ax7 vs 12AT7 vs 7025 etc. 7025: This is the low noise, "industrial" version of the 12AX7. For the price, this tube has the cleanest high end of any of the similarly priced modern 12AX7. As for V1 in general, but especially for higher gain amps or phono/audio-amps, we recommend the RT010 7025 Highgrade or the RT030 E83CC/7025 Highgrade. Price = for a pair of 2 tubes! This CK-5755 is a double-triode made by Western Electric (USA) for Raytheon. These reviews are a vital resource for learning about manipulating your amplifier's tone through better tube choices. Cryo Preamp Tubes-> Cryo 12AT7 / ECC81 / 6201 Cryo 12AU7 / ECC82 Cryo 12AX7 / ECC83 Cryo 12AY7 Cryo 12BH7 / 6350 Cryo 12DW7 / ECC832 Cryo 5751 Cryo 6922 / 6DJ8 / E88CC / 6N1P Cryo 6C45PI Cryo 6CG7 / 6FQ7 Cryo 6H6P. GE used/tested 7025 $25. I was hitting it with finger quite hard with no audible effects 🙂 Very smooth sound, not as smooth as RCA 12ax7 Long Gray Plates, but quite close. Tube Depot carries a selection of 12AX7 / ECC83 / 7025 / CV4004 Pre Amp Vacuum Tubes. They're called lower hum and lower noise tubes, but if you look at the old spec sheets, there's no specific design element or electrical characteristic a 7025 is speced for that a 12ax7 isn't -- even the spiral filament thing, I don't know that every 7025 had spiral filaments -- never mind any potential other noise or microphony lowering construction elements (like shorter plates or more or thicker spacers or something). DOWNLOAD PDF. google "12ax7 vs 7025": get responses like: In the old days the 12AX7 and 7025 were different quality tubes. NOS in original boxes labeled as Motorolla and Truetone. Now that said the original 12ax were long plates, then the Euro stuff like mullard and Phillips copied them. 7025/ECC83 equivalent Have a question? Find answers in product info, Q&As, reviews There was a problem completing your request. 12AX7 is the US number. It is especially suited for use in resistance-coupled voltage amplifiers, phase inverters, multivibrators, and numerous industrial-control circuits where high voltage gain is desired. Denon DJ SC6000M Prime. Corresponds to ECC83 and 7025. This is an excellent valve to improve the sound of bland and thin sounding amplifiers. Karel De Reus † #N#ECC83: Peter Roggenhofer. I tutaj pytanie jakie najlepsze lampy będą do moj. This is why vintage Fender tube chart calls for 7025. The Europeans had this too and called this specials designs E83CC (simply a mix of the number and capitals). KCA NOS Tubes. Re: Fender preamp tubes 7025 vs 12AX7 Right, in the 50ies those 7025 had a different heater/cathode design, later on the 7025 was simply a selected and tested item. The tonal characteristics were a bit different too but not sure if that is a direct result of the tubes or the tubes interaction with the other circuitry. They are very close but the gold pin will have slightly less gain in the mids. In other words if your amp is designed for a 7025 you can't go down to a 12AX7. A modern 12AX7 with a W prefix means nothing in particular. Thanks to its design it also peforms with very low noise and microphonics. It was released for public sale under the 12AX7 identifier on September 15, 1947. The plate voltage is around 100 volts vs the RCA that operates at 200+ volts in other gear. A great sounding 12AX7 tube type that reminds me a little more of the ECC83 that EI made in the old days. Really just depends on the tube and more importantly the tube compared to what you have currently. "The Type 7025 is identical to the 12AX7 except for improved noise and hum characteristics. Tubes test as premium new with very low noise--guaranteed not to be microphonic!. Standard Delivery Times. It's also more heavy duty so it can take a beating. all I have is a picture. They're called lower hum and lower noise tubes, but if you look at the old spec sheets, there's no specific design element or electrical characteristic a 7025 is speced for that a 12ax7 isn't -- even the spiral filament thing, I don't know that every 7025 had spiral filaments -- never mind any potential other noise or microphony lowering construction elements (like shorter plates or more or thicker spacers or something). 7025 Bent 'D" getter, Orange Lettering and reinforced top mica: The 7025 label is often a military version, or ruggedized version of the standard 12AX7 or ECC83. These are usually the best choice for demanding hi-fi applications, although the premium brands and blackplate types also have very low noise. 12AX7 Vs 7025, Ok whats the deal here I had an issue with my Achillies Super Reverb (Power surge at home ) which took out the Rec tube and a preamp tube. Groove Tubes 7025 (black plate E! 12AX7): This tube is DA THING! The sexiest midrange I've ever heard, hope the new shiny plates are just as good. Tube Interchangability Reference. I Tetrodi: Sono valvole che rispetto ai triodi, hanno una griglia in più che è chiamata griglia schermo e ha la funzione di ridurre la capacità che si crea tra l'anodo e la griglia di controllo. Post subject: Re: 12AX7/7025 Tubes. 12AX7, 7025, ECC83 - zamienniki i opinie Zaloguj się, aby obserwować tę zawarto Ja stosuję Electro-Harmonixy 12AX7 Gold Pin - wg mnie są rewelacyjne. The Lorenz ECC83s sound very nice, too. " From the RCA spec. (As known as the 9th gen). 7025 is higher in gain and a bit brighter then the 12AX7. Tung-Sol 12AX7 / ECC83. Epiphone Uptown Kat ES Ruby. Played clean the TAD 7025 WA delivers a warm liquid tone which is very responsive to dynamic playing. Phenomenal Valvo or Siemens Halske ECC83 12AX7 "LONG PLATES" 1950's "D-FOIL-GETTER" NOS SINGLE TUBE OR PAIR! Add 1967 NOS GE USA JAN 12AX7 WA 7025 MILITARY ECC803S DIGITAL BALANCED PERFECT TRIO. The tube would work but not well. In an amp you can replace a 12AX7 with a 7025 but not vice versa. 5751s fly just a little under the radar and so you can get good ones at a better price. RCA and Sylvania first introduced the 12AX7 to the world in the late 1940's. This 7025 tube is regarded as the holy grail among the double-triode preamp valves. Co istotne, to "zwykłe" 12AX7 EH grają zupełnie inaczej - gorzej od tych na złotych nóżkach. 5751) is identical over the tubes' operational ranges. One thought on " RCA 7025 Short Plates " nick-seattle on May 11, 2012 at 3:29 PM said: Great overall tube with fantastic balance - and definitely no microphincs. - Hungary - Last One Tube : Single Tube = $ 130. By Sylvania. TAD 7025 S - Mullard předzesilovací elektronka ECC83 12AX7. The reissue Genalex Gold Lion ECC83 / B759 tube is New Sensor's modern-day effort to recreate the renowned sound signature of the vintage European original. 1960's and 70's types were 12AX7A's or low noise 7025's which had ribbed gray plates. Tra l' altro la valvola 6C10 per me era introvabile. all I have is a picture. The Mullard 12AX7 Preamp Tube delivers a large sound stage with excellent detail. Changing tubes in an amp can be a particularly challenging experience, especially since there seems to be such an abundance of them. The 6N2P-EV, (Russian: 6?2?-??) is a miniature 9-pin dual triode vacuum tube manufactured in USSR , Russia and China with characteristics similar to the RCA 12AX7. 12ax7/ecc83gen Super premium pins high-gain twin triode, faithfully reissued from the original Genalex Gold Lion ECC83/B75. The reissue Genalex Gold Lion ECC83 / B759 tube is New Sensor's modern-day effort to recreate the renowned sound signature of the vintage European original. That's a pretty nice compliment. Price: $40. 얘하고 깨진 RCA 블랙플레이트가 제일 좋아하던 한쌍이었습니다. 12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual triode - 6AV6 with high voltage gain. A great sounding 12AX7 tube type that reminds me a little more of the ECC83 that EI made in the old days. The ECC83S (12AX7) from JJ is a very low noise. 12AX7, 5751 and 7025 tube reviews by John Templeton. Tube amps use multiple tubes, and the first position is referred to as V1. The Europeans had this too and called this specials designs E83CC (simply a mix of the number and capitals). Factory selected for low noise and minimum microphonics. The gain is the same.
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