7025 Vs 12ax7

The most significant difference between the two is that 6N2P has its two filament elements connected in parallel, unlike the series filament connection of the 12AX7, and it is thus only possible. EH 12AX7, when nothing else works. 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。. 1960's and 70's types were 12AX7A's or low noise 7025's which had ribbed gray plates. And, remember, the greater the BW, the more "sparkle" and "chime" we're likely to perceive. For a comparison of all the 12AX7's we carry, click on the tech corner link at the top of this page. 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. I can't really offer much help on the new production tubes, but I do know my way around NOS tubes pretty good. The ECC83 MG is a "Mid Gain" 12AX7 type tube. 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. 00 each or $60. The 12AX7 had a more bite and grit with a punchier overdrive. Thinning out + Selling off many vintage 12AX7 / 7025 / 5687 / ECC83 tubes + 12AU7 / ECC82 / 6189 / 5963 / 12AT7 / 6201 / ECC81 @ $35. I have a few Tube preamps, one of which is a Cary Audio CAD-5500S. 12AX7: Since this is the most common tube in guitar amps, a wide variety of brands (including some resurrected old brands) are available to choose from. In the old days when not all 12AX7 were equal, low noise 12AX7 was given a different type code - 7025. This has a spiral wound filament which reduces hum and noise. You can find curve plots for 12AX7 Chinese, Sovtek, and Tesla on our Tube Data Page. They are very close but the gold pin will have slightly less gain in the mids. Classic tube for all Fender and similar amps. Nowadays tubes are not made this specific so the name mean almost nothing except on old tubes. The plate voltage is around 100 volts vs the RCA that operates at 200+ volts in other gear. The 12AX7 is a 9-pin miniature, high-mu, twin triode. The Audo Catalog Pages are also focused on listners of all types of hi End Electron Tube Guitar amplifiers and Hi End Vacuum Tube audio amplifiers. The tubes have well balanced triode pairs and a very even flat response. Lots of gain with a rather low noise floor. all I have is a picture. To reiterate: 5751 is a lower gain sub for 12AX7, and 7025 is a low-noise 12AX7 (same spec). Any good GE or RCA 12AX7A or 7025 should give you nice, fat tone. 12AX7 Basics. Bien selectionnées ces lampes modernes sont très bien. This item is in stock and can be dispatched immediately. It is used in 99% of all guitar amplifiers. These are usually the best choice for demanding hi-fi applications, although the premium brands and blackplate types also have very low noise. RCA 12AX7's seem to be very popular for electric guitar. Il suono è fantastico e devo dire che tad ha dei prodotti di ottima qualita. ) typically reduces circuit gain by 28% and slightly increases BW by 4%. Review – Mullard 12AX7 / ECC83 Reissue Tube POSTED BY JOHN TEMPLETON ON MARCH 10, 2014 IN 12AX7, 7025 AND 5751 TUBES | 1,110 VIEWS | 1 RESPONSE Mullard 12AX7 / ECC83 Reissue is a nice tube but in my opinion better suited to home audio than guitar amps. The only claimed changes are lowered hum, lowered noise and microphonics (in some sheets). 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. TC Tubes and Audio Repair Repair services include tube and solid state gear, turn table set-up, and tube-testing in Twin Cities Metro Area. There was a reason for having tube testers in every. Any good GE or RCA 12AX7A or 7025 should give you nice, fat tone. Fue comercializada por Groove Tubes como "7025" (denominación industrial) en los tiempos de gran disposición de modelos, hasta que se agotó su stock. 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. The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for. It was developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522. In an amp you can replace a 12AX7 with a 7025 but not vice versa. So the bottom line is that you can use either of these tubes in your Marshall amp. Also included in this comparison are direct substitutes for the 12AX7 including: ECC83, ECC803, 7025 and 5751. Also, as tube manufacturing became refined, the 12AX7A became much quieter. JJ 12AX7 / ECC83S / 7025 Gold Pins. Very smooth and warm sound. Displaying products 1 - 13 of 13 results: Show: Sort: Genalex Gold Lion 12AX7 / ECC83 / B759 - gold pins. was the originally supplied tube to Fender in the 1950s if you want to be period-correct. A Comparison of Current Production 12AX7 Tubes by Kurt Prange. Changing tubes in an amp can be a particularly challenging experience, especially since there seems to be such an abundance of them. Similarly, substituting a 12AY7 for a 12AX7 reduces circuit gain by almost half (45%) but nearly doubles the BW. Really just depends on the tube and more importantly the tube compared to what you have currently. This 7025 tube is regarded as the holy grail among the double-triode preamp valves. The ECC83 Gallery 12AX7 E83CC 7025 ECC803S : 5751 CV4004 CV492 B339. If you look closely at all the sheets, all conditions listed for the 12AX7 are identical to the 12AX7A and the 7025. Compared to the JJ ECC83-S this tube sounds a little more eager to hit the midrange. 12AX7: Since this is the most common tube in guitar amps, a wide variety of brands (including some resurrected old brands) are available to choose from. But the real cool tubes are the long plate types from the plant in Hamburg. You can find curve plots for 12AX7 Chinese, Sovtek, and Tesla on our Tube Data Page. 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. 12ax7wa Amperex. TAD RT010 Tube 7025 Highgrade. L'atelier est fermé "jusqu'à nouvel ordre". 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. Visit us now!. Given the gain, it is generally very low noise and microphonics. 6681 Disclaimer Submit a tube. 12AX7s are components, early in the circuit, that determine how clean or, how lush, layered and massive the high gain will be - not to mention all the tonal shades of grey in between like clipped, overdriven and crunch sounds. The JJ ECC83S / 12AX7 is perhaps the most consistently high gain of all 12AX7's. Mesa Boogie Tube SPAX 12AX7. Corresponds to ECC83 and 7025. New Old Stock. The Europeans had this too and called this specials designs E83CC (simply a mix of the number and capitals). The 7025 came stock in some of the Blackfact Fender amps. Compared to the JJ ECC83-S this tube sounds a little more eager to hit the midrange. EUR 70,00 +EUR 8,45 spedizione; 12ax7 ecc83 5751 12AX7 12ax7a 6072 7025 m. 12AX7 Basics. So off spec in the more gain direction. La 12AX7 fue desarrollada para reemplazar al doble triodo de base octal 6SL7 para ser usada en. The 5751 version of the 12AXY tube is a military version that is rugged and has a lower Gain of 70. This is according to the RCA receiving tube manual. These tubes are high gain, low noise, and are VERY warm and detailed. The 12AT7 is used as a driver tube in many old Fender amps. We will take a look at why you might, or might not want to swap out the different types of tubes. Jackson Pro Dinky DK Mod. It's also more heavy duty so it can take a beating. First tube the 12AY7 preamp or the 12AX7 or 5751 voltage amp, Second and third tubes are 12AX7 drivers. The 12AX7 was made for quite a while. Il suono è fantastico e devo dire che tad ha dei prodotti di ottima qualita. 같은 관에 12ax7, 7025 모두 각인된 경우도 많구요. electro-harmonix / 12ax7eh 真空管 プリ管 12ax7 ロシア製 互換真空管 12ax7a,12ax7wa,12ax7wb,7025,5751,12ax7wc,ecc83,e83cc. Our new EHX Strings Electro-Harmonix electric guitar strings are custom-designed to our specifications. 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. Review – Mullard 12AX7 / ECC83 Reissue Tube POSTED BY JOHN TEMPLETON ON MARCH 10, 2014 IN 12AX7, 7025 AND 5751 TUBES | 1,110 VIEWS | 1 RESPONSE Mullard 12AX7 / ECC83 Reissue is a nice tube but in my opinion better suited to home audio than guitar amps. Our tubes are always tested, matched and guaranteed. After the original 12AX7, additional variants were issued with various industrial numbers (including the 7025) as well the 12AX7A. It's just that an NOS 12AX7A tube is considered to be premium over the 12AX7. See our Best 12AX7 Review for more information. Corresponds to ECC83 and 7025. In Colby and Park amps, I use Tung Sol, Chinese, and JJ 12AX7 tubes, as well as the Sovtek 12AX7LPS. The above SPICE models for various valves and most of these models are for use with PSpice from Orcad. RCA 7025: Standard RCA vacuum tubes are available in large quantities on eBay. The 5751 has identical plate resistance to the 12AX7, but the gain is 70 compared to 100 for the 12AX7. The new Sovtek 12ax7LPS is supposed to be the modern equivalent of the 7025. Vintage European and US 12AX7, ECC83, 5751, 7025, CV4004, CV492, and M8137 tubes in stock now, fully tested and guaranteed. Used in many current. So much in fact that a lot of 12AX7A's were labeled 7025's (a very quiet version of the 12AX7). Either the Tianjin ECC83 or any of the China 7025 tubes is preferable to the Psvane… and the Tube Store "Preferred Series 7025" is a GREAT tube for only $25; I prefer it by far to the modern New Sensor Mullard re-issue 12AX7 by a huge margin and even favor it over the expensive Gold Lion 12AX7 reissue tubes in certain applications. Great for warm clean tones and creamy overdrive. If someone could take a look at it and tell me if The RCA 7025 was 12AX7 with a different. 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?. sheet, from April 1959: "For high-fidelity audio-amplifier applications critical as to noise and hum. 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. The 12AX7 is also used in many audio preamps and in guitar effects pedals. Vintage 1950-60's 12AX7A is an "updated" lower noise version of 12AX7 It has to do with the way the heater is designed. Fue comercializada por Groove Tubes como "7025" (denominación industrial) en los tiempos de gran disposición de modelos, hasta que se agotó su stock. The Tube Store 7025 hummed big time (because of my amp, not the tube IMHO). I have not tried 7025 Long. 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. 12AX7=ECC83 MULLARD "RIBBED PLATES" NOS 1960's (12AX7 Mullard 1960's vintage have great midrange tone and bass, an excellent 12AX7, 161 or 163 date codes) - Top Hat King Royale - Soldano SLO-100 (Mark Knopfler, Eric Clapton) - Marshall 1959HW Plexi - Marshall JVM-210H 2007-2008 - Diezel Herbert head - Gibson GA-6 1957 - Trace Elliot C30 - Mesa Boogie Triaxis 2 preamp - Mesa Boogie Mark 2C. 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. ( 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. 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。. ECC81 is 12AT7 medium gain pre-amplifying double triode. 7025 * * * * The 7025 has a higher gain than a 12AX7 tube. RCA 12AX7: This is a 7025 alternative that delivers less efficient transfers of power but boasts greater noise reduction capabilities. No microphonic issues even with the most sensitive preamps. A great sounding 12AX7 tube type that reminds me a little more of the ECC83 that EI made in the old days. Harmonically rich, with a detailed low end and a warm high end. Tube Interchangability Reference. 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. TAD ECC83-Cz (verified JJ ECC83S) in Marshall DSL50. 5751s fly just a little under the radar and so you can get good ones at a better price. Also known as the Groove Tubes ECC83-S and Ruby 12AX7ACZ HG. 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). Neat - and only 9 pins. Both of these Tung Sol 12AX7's are ECC803S. Price = for a pair of 2 tubes! This CK-5755 is a double-triode made by Western Electric (USA) for Raytheon. Unique spiral filament eliminates filament to cathode induced hum common on amplifiers that use AC on the filaments. For example, a Czechoslovakian made JJ 12AX7 will be different from a Soviet-made SOVTEK 12AX7. The tube's detailed, musical tone rivals the most desirable NOS types. 7025: This is the low noise, "industrial" version of the 12AX7. The quality of Philips ECC83 has always been very good. It was developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522. Any good GE or RCA 12AX7A or 7025 should give you nice, fat tone. 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. Corresponds to ECC83 and 7025. Problem is that most current tube distributors will use '12AX7', ECC83 & 7025 in their descriptions because they are interchangeable in the circuit. It's a very common gain stage that's used in many amps. 5751: Military version/drop in replacement for the 12AX7, but is actually different. Displaying products 1 - 13 of 13 results: Show: Sort: Genalex Gold Lion 12AX7 / ECC83 / B759 - gold pins. 12AX7 tube is the most common preamp tube today. The tubes have well balanced triode pairs and a very even flat response. 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. La 12AX7 o ECC83 es una válvula doble triodo de base noval B9A con un elevado grado de ganancia. The most significant difference between the two is that 6N2P has its two filament elements connected in parallel, unlike the series filament connection of the 12AX7, and it is thus only possible. In the old days when not all 12AX7 were equal, low noise 12AX7 was given a different type code - 7025. Epiphone Uptown Kat ES Ruby. So much in fact that a lot of 12AX7A's were labeled 7025's (a very quiet version of the 12AX7). 12AX7 / 12AX7A / 7025 TUNGSOL USA (one of the best US 12AX7 ever made, very dynamic and musical with superb tonal balance, better overall than RCA) TO BUY 12AX7 Tungsol 1951-1960's. Posted: Mon Apr 28, 2014 4:39 am. RCA engineers developed it around 1946 and released it for sale as the 12AX7 shortly after. My Favorite Tubes and Their Substitutes by Robert H. 12df7 Sylvania. If you look closely at all the sheets, all conditions listed for the 12AX7 are identical to the 12AX7A and the 7025. 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. The Mullard 12AX7 Preamp Tube delivers a large sound stage with excellent detail. d similar / same as the 12ax7. Also, as tube manufacturing became refined, the 12AX7A became much quieter. The 12AT7 is used as a driver tube in many old Fender amps. The TAD 12AX7A-C can replace any 7025, 12AX7WA, 12AX7WB, 12AX7LPS, 12AX7EH, ECC83 or E83CC. It has a very full and musical sound signature. A modern 12AX7 with a W prefix means nothing in particular. That said, I have heard distinct differences between RCA short gray-plate 7025 (more chime and clarity) and the identical-look RCA 12AX7A short gray-plate (fat, strong lows, harsher highs, murkier character). I have a few Tube preamps, one of which is a Cary Audio CAD-5500S. The 12AX7 was made for quite a while. The Lorenz ECC83s sound very nice, too. GE used/tested 7025 $25. This is according to the RCA receiving tube manual. 12AX7 is the US number. Hello to all forum members. Peavey 5150 Tube Set, JJ Tubes (x4 6L6GC, x5 12AX7), Apex Matched. So a NOS 12AX7 with a suffix starting with 'W' is a military valve. If you look closely at all the sheets, all conditions listed for the 12AX7 are identical to the 12AX7A and the 7025. Generally, many companies had their own designations and suffixes and prefixes to make their product stand out. To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. Radio tubes are valves. Peter Roggenhofer † 25. Also included in this comparison are direct substitutes for the 12AX7 including: ECC83, ECC803, 7025 and 5751. Many company's 7025s are simply 12AX7s that have been tested for low noise. (As known as the 9th gen). European code for 12AX7 high-gain twin-triode. 5751 Sylvania. In an amp you can replace a 12AX7 with a 7025 but not vice versa. Both of these were lower noise versions of the 12AX7. The standard is VERY high quality/. So do some of the Chinese 12AX7s. There are many versions of the 12AX7 tube and many brands. This represent standard construction / quality / hum / micrphony etc. It's also more heavy duty so it can take a beating. Shop our great selection of 12AX7, 12AX7A, 12AX7EA, 7025, ECC83, ECC803S, 5751 (low gain), CV492, 7058, 12DF7, CV4004, B339, E83CC, M8137vacuum tubes now. La 12AX7 o ECC83 es una válvula doble triodo de base noval B9A con un elevado grado de ganancia. The only claimed changes are lowered hum, lowered noise and microphonics (in some sheets). It was sold as a "lower noise" version of the 12ax7, but is identical in electrical characteristics. I can't really offer much help on the new production tubes, but I do know my way around NOS tubes pretty good. TAD RT010 Tube 7025 Highgrade. You can find curve plots for 12AX7 Chinese, Sovtek, and Tesla on our Tube Data Page. Today's new production Tung-Sol tubes are constructed with the same commitment to quality and reliability. The 7025 WA supports a fat midrange and creates a bold tone with lots of overtones. It's just that an NOS 12AX7A tube is considered to be premium over the 12AX7. By Marconi Radiotron. It utilizes a medium length ribbed plate design that is much like the old Amperex and Brimar European designs. To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. Il suono è fantastico e devo dire che tad ha dei prodotti di ottima qualita. European code for 12AX7 high-gain twin-triode. 같은 관에 12ax7, 7025 모두 각인된 경우도 많구요. 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. Both of these Tung Sol 12AX7's are ECC803S. Battle of 12AX7. 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. Balance Tungsol Russia. The JJ ECC83-MG is a fine sounding tube. A bit weird as the tubes seemed fine when switched into another amp for testing Anyway got a tech to check it out and he replaced them and all good now. You can use Google and check out lots of information 12AX7A vs. 12ax7a Sylvania. The 5751 version of the 12AXY tube is a military version that is rugged and has a lower Gain of 70. Tra l' altro la valvola 6C10 per me era introvabile. ECC83S - 12AX7, 7025 A. No microphonic issues even with the most sensitive preamps. They are rare, coveted and sound even better than the Russian tubes. Because of the high gain, 12AX7 in V1 has a lot of effect on sonics. 참고로, 제가 가진 12ax7 계열은 55년 ~ 69년입니다. GE used/tested 7025 $25. Die ECC83 (amerikanische Bezeichnung: 12AX7) ist eine Elektronenröhre (Doppel-Triode), die vorwiegend für Niederfrequenz-Anwendungen konzipiert wurde. Re: 12AX7 vs. 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. Thanks to its design it also peforms with very low noise and microphonics. The TAD 7025 Highgrade can replace any ECC83, E83CC, 12AX7, 12AX7A, 12AX7M, 12AX7WA/WB/WC/LPS/EH, 5751 or 7025. The Europeans had this too and called this specials designs E83CC (simply a mix of the number and capitals). 진공관 찾으러 박스도 몇번 뒤지고, 친구네서 하나 얻어오고, 소리전자 중고장터에서 하나 샀습니다. EUR 69,00 +EUR 8,45 spedizione; 1x 12ax7a = 5751 ecc83 USA NOS Tube Tubo Valvola. That said, I have heard distinct differences between RCA short gray-plate 7025 (more chime and clarity) and the identical-look RCA 12AX7A short gray-plate (fat, strong lows, harsher highs, murkier character). Today's new production Tung-Sol tubes are constructed with the same commitment to quality and reliability. Recommended for the 1st gain stage. Classic tube for all Fender and similar amps. So a NOS 12AX7 with a suffix starting with 'W' is a military valve. La 12AX7 o ECC83 es una válvula doble triodo de base noval B9A con un elevado grado de ganancia. 12AX7, 7025 and 5751 Tubes. There are many 12AX7 on the market today. 7025 * * * * The 7025 has a higher gain than a 12AX7 tube. The only claimed changes are lowered hum, lowered noise and microphonics (in some sheets). 7025 compared to the 12AX7 are the better tubes and have much higher standards. It is used in 99% of all guitar amplifiers. ECC83S is 12AX7 high gain pre-amplifying double triode. To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. These days, the designation "7025" is just a buzz word. Unique spiral filament eliminates filament to cathode induced hum common on amplifiers that use AC on the filaments. I swear, the 12AX7 and all of its mutant cousins probably has more mystique in its history than any other low level audio tube. The 12AT7 is used as a driver tube in many old Fender amps. Many company's 7025s are simply 12AX7s that have been tested for low noise. These days, the designation "7025" is just a buzz word. In an amp you can replace a 12AX7 with a 7025 but not vice versa. Tube 12AX7 or Röhre 12AX7 ID3730, Double Triode, Noval, B9A and Audio Frequency shown. Both of these were lower noise versions of the 12AX7. Ale nawet nie wiem na jakim gnieździe gdzie jaka lampa powinna być. So do some of the Chinese 12AX7s. Die ECC83 (amerikanische Bezeichnung: 12AX7) ist eine Elektronenröhre (Doppel-Triode), die vorwiegend für Niederfrequenz-Anwendungen konzipiert wurde. After the original 12AX7, additional variants were issued with various industrial numbers (including the 7025) as well the 12AX7A. electro-harmonix / 12ax7eh 真空管 プリ管 12ax7 ロシア製 互換真空管 12ax7a,12ax7wa,12ax7wb,7025,5751,12ax7wc,ecc83,e83cc. JJ Electronic ECC83MG - 12AX7 Factory Data Sheet: ECC83MG Our observations: Another 12AX7 variant from JJ. Create your own unique tone and love your gear again!. 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。. My question is this: what is the difference between the 12AX7 and the 7025?. google "12ax7 vs 7025": get responses like: In the old days the 12AX7 and 7025 were different quality tubes. Mesa Boogie Tube SPAX 12AX7. 5E3 Deluxe Second Gain Stage. 12AX7, 7025 and 5751 Tubes. By Sylvania. • 7025/ECC83 equivalent Strongly committed to quality manufacturing, Tung-Sol tubes have always been known for their reliability and great tone. 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). The 6N2P, (Russian: 6Н2П), also sometimes spelled in English "6H2Pi", is a miniature 9-pin dual triode vacuum tube manufactured in USSR, Russia and China with characteristics similar to the RCA 12AX7. Balance Tungsol Russia. A 7025 is a low noise version of the 12AX7, originally developed for the military. Harmonically rich, with a detailed low end and a warm high end. Die Verbundröhre verfügt über zwei unabhängige und elektrisch identische Trioden-Systeme in einem Glaskolben. See our Best 12AX7 Review for more information. We carry a vast number of 12AX7 tubes to help you get the right sonic from your gear. GE used/tested ANOS 12AX7 & 12AX7A ( 1960s Gray Plates ) $ 20. Thus, substituting a 5751 for a 12AX7 (or ECC83, 7025, etc. Audio tubes for guitar amplifiers and audiophile equipment. Flying Leads Plug&Play CV4035 - Premium 12AX7 ECC83 ECC803S E83CC 7025 CV4004 CV492 M8137 M8214 6057 type. The only claimed changes are lowered hum, lowered noise and microphonics (in some sheets). The JJ ECC83-MG is a fine sounding tube. Usage in Models. But the real cool tubes are the long plate types from the plant in Hamburg. Beautiful tubes ECC83 is the british name for a 12AX7. "The Type 7025 is identical to the 12AX7 except for improved noise and hum characteristics. 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。. The 7025 valve is a low hum and low noise version of the ECC83, but whether you’ll hear the difference is debatable. ANOS RAYTHEON LONG BLACK PLATE 12AX7 $35. RCA 12AX7's seem to be very popular for electric guitar. Besondere, auf die Anwendung als Audioverstärker ausgerichtete Merkmale sind ihr geringes. 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 Tubes. By Sylvania. The tubes have well balanced triode pairs and a very even flat response. Thus, substituting a 5751 for a 12AX7 (or ECC83, 7025, etc. ARS Electronics Since 1947 - Audio Catalog Page. 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. This amp looked brand new and still had all its original tubes. Hello all, I was wondering about your opinions on the 12AX7-type preamp tubes. 12AX7, 7025 and 5751 Tubes. 며칠전 트위드 챔프에 있던 50년대 후반 RCA 12ax7 관을 하나 깨먹었습니다. There are many versions of the 12AX7 tube and many brands. Review - Mullard CV4004 / 12AX7 Reissue. Post subject: Re: 12AX7/7025 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). 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. The ars catalog pages are for electron tube lovers world wide who repair and replace vacuum tubes and related parts for electron tube amplifiers. The 12AX7 is by far the best known preamp tube among guitar players. By this scoring, the best tube overall is the Electro-Harmonics 12AX7. 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. Attention restrictions COVID 19 : Livraison seulement pour la FRANCE métropolitaine. A center-tapped heater permits operation of the tube. 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. Also included in this comparison are direct substitutes for the 12AX7 including ECC83, ECC803, 7025 and 5751. • 7025/ECC83 equivalent Strongly committed to quality manufacturing, Tung-Sol tubes have always been known for their reliability and great tone. Two of the ECC83 / 12AX7 and two of the 7025's. It's just that an NOS 12AX7A tube is considered to be premium over the 12AX7. Review - Mullard CV4004 / 12AX7 Reissue. RUSSIAN DOUBLE TRIODE TUBE 6N2P-EV. Tubes test as premium new with very low noise--guaranteed not to be microphonic!. Can be also used as replacement for 12AX7 in many applications. If you are looking to upgrade the tubes in your amp, 12AX7 in V1 where you want to start. 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. A 12AT7 is a lower gain tube from a 12AX7/7025/ECC83. Best for clean tones as well as for those deep-bass required for modern preamps. Tung-Sol 12AX7 / ECC83. 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 12AX7 is also used in many audio preamps and in guitar effects pedals. The 12AX7A seems to have appeared in 1960. google "12ax7 vs 7025": get responses like: In the old days the 12AX7 and 7025 were different quality tubes. Il suono è fantastico e devo dire che tad ha dei prodotti di ottima qualita. The Westinghouse tall ribbed plate are poor. They are very close but the gold pin will have slightly less gain in the mids. 며칠전 트위드 챔프에 있던 50년대 후반 RCA 12ax7 관을 하나 깨먹었습니다. Also, as tube manufacturing became refined, the 12AX7A became much quieter. 7025: This is the low noise, "industrial" version of the 12AX7. GE used/tested ANOS 12AX7 & 12AX7A ( 1960s Gray Plates ) $ 20. ) sound nice. By this scoring, the best tube overall is the Electro-Harmonics 12AX7. So do some of the Chinese 12AX7s. Hello to all forum members. 12AX7 (also ECC83, 7025) Preamp Vacuum Tube. Fue desarrollada en 1946 por los ingenieros de RCA [1] en Harrison, Nueva Jersey, con el número de desarrollo A-4522. The ECC83S (12AX7) from JJ is a very low noise. Today, it is by far the most common preamp tube used for electric guitar amplification and there is an almost overwhelming supply of current production options to choose from. 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. Flying Leads Plug&Play CV4035 - Premium 12AX7 ECC83 ECC803S E83CC 7025 CV4004 CV492 M8137 M8214 6057 type. The most significant difference between the two is that 6N2P has its two filament elements connected in parallel, unlike the series filament connection of the 12AX7, and it is thus only possible. Sovtek 12AX7 WB / 7025 Cryo Matched Pair (2) $38. The JJ ECC83 has darker sound characteristics and great for metal and hard rock. The 7025 came stock in some of the Blackfact Fender amps. It is a high gain valve and has short. 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. ECC83 vs 12Ax7 Tubes – What is the Difference? One of the more confusing things about tube amps is changing them, especially when there seem to be so many different kinds available. I swear, the 12AX7 and all of its mutant cousins probably has more mystique in its history than any other low level audio tube. 12AX7, 5751 and 7025 tube reviews by John Templeton. " From the RCA Receiving Tube Manual, for 7025:. Il suono è fantastico e devo dire che tad ha dei prodotti di ottima qualita. 3vが6vでも問題はありません). Positive Feedback ISSUE 76 november/december 2014. Followers 0. You can beat the crap out of it and it will still go! Interesting notes: I have heard that ECC803S tubes (12AX7's on Steroids) are great for guitar amps because they have a spiral filament for reduced. The gain is the same. Ultra-low noise, but also approximately 3 dB less gain than the normal 12AX7 (RT001) - recommended for problems with microphones. The only claimed changes are lowered hum, lowered noise and microphonics (in some sheets). So much in fact that a lot of 12AX7A's were labeled 7025's (a very quiet version of the 12AX7). Get it from a supplier that tests the tubes for low noise and strength. Guitar amplifier parts, guitar amplifier tubes and guitar amp tubes 12ax7, 6v6gt, EL84. Slightly taller than the Ruby & Tubestore 12AX7. "The Type 7025 is identical to the 12AX7 except for improved noise and hum characteristics. This are high quality hi-durable, long-life ( > 5000 hours ) double triode tubes were made in USSR for the military equipment. 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. 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. Une fonction tenue par une 12ax7 peut-être tenue par une autre 12AX7, pas de souci. 12AX7 is a high gain tube often used in the first stages of tube amps. 12AX7, 5751 and 7025 tube reviews by John Templeton. 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 vs 12AT7 vs 7025 etc. 12ax7 vs 12AT7 vs 7025 etc. Tube Depot carries a selection of 12AX7 / ECC83 / 7025 / CV4004 Pre Amp Vacuum Tubes. 12AX7 (also ECC83, 7025) High gain preamplifier tube with ultra low noise and detailed, musical tone. Compared to the JJ ECC83-S this tube sounds a little more eager to hit the midrange. 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. 12ax7/ecc83gen Super premium pins high-gain twin triode, faithfully reissued from the original Genalex Gold Lion ECC83/B75. Order tubes BEFORE they need to be replaced, and save the gig. We need a mention the fourth member of the Sovtek 12AX7 family. 00 each or $60. Source Legend: DC Dave Cigna / Francesco Piazza DM Me!. 12AX7 / 12AX7A / 7025 TUNGSOL USA (one of the best US 12AX7 ever made, very dynamic and musical with superb tonal balance, better overall than RCA) TO BUY 12AX7 Tungsol 1951-1960's. 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. First tube the 12AY7 preamp or the 12AX7 or 5751 voltage amp, Second and third tubes are 12AX7 drivers. 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. RUSSIAN DOUBLE TRIODE TUBE 6N2P-EV. Tung-Sol 12AX7 / ECC83. A modern 12AX7 with a W prefix means nothing in particular. Guitar amplifier parts, guitar amplifier tubes and guitar amp tubes 12ax7, 6v6gt, EL84. The 12AX7 is a 9-pin miniature, high-mu, twin triode. Similarly, substituting a 12AY7 for a 12AX7 reduces circuit gain by almost half (45%) but nearly doubles the BW. Title: 12AX7 6AX7 Author: Sylvania Subject: JA-FP-2002-03-23 Created Date: 3/24/2002 12:54:30 AM. Any good GE or RCA 12AX7A or 7025 should give you nice, fat tone. I tutaj pytanie jakie najlepsze lampy będą do moj. Epiphone Uptown Kat ES Ruby. My question is this: what is the difference between the 12AX7 and the 7025?. 12AX7 tube is the most common preamp tube today. Tube amps use multiple tubes, and the first position is referred to as V1. Tube Interchangability Reference. Tubes test as premium new with very low noise--guaranteed not to be microphonic!. 12AX7s are components, early in the circuit, that determine how clean or, how lush, layered and massive the high gain will be - not to mention all the tonal shades of grey in between like clipped, overdriven and crunch sounds. The new Sovtek 12ax7LPS is supposed to be the modern equivalent of the 7025. Thus, substituting a 5751 for a 12AX7 (or ECC83, 7025, etc. In many cases, these tubes are interchangeable and can easily be swapped. 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. RCA 12AX7: This is a 7025 alternative that delivers less efficient transfers of power but boasts greater noise reduction capabilities. d similar / same as the 12ax7. Both of these Tung Sol 12AX7's are ECC803S. As a result the El34's in the Laney example get a big final push from the pre-amp stages. 같은 관에 12ax7, 7025 모두 각인된 경우도 많구요. Please try your search again later. 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 hits the numbers pretty well for a new production valve. Also included in this comparison are direct substitutes for the 12AX7 including: ECC83, ECC803, 7025 and 5751. The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for. It has same specs as 12AX7A / ECC83 / 7025 but with different pinout for Pin 2+3 and 6-8 (see data sheet). 12AX7 is a miniature dual triode tube with high voltage gain. Bien selectionnées ces lampes modernes sont très bien. So a NOS 12AX7 with a suffix starting with 'W' is a military valve. 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. JJ 12AX7 / ECC83S / 7025 Gold Pins. You can find curve plots for 12AX7 Chinese, Sovtek, and Tesla on our Tube Data Page. It has a very full and musical sound signature. European code for 12AX7 high-gain twin-triode. 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. ECC83 est la désignation européenne, alors que 12AX7 est la désignation US. As SD97 noted a 7025 was a military tube. I typically use Tung Sols in the first preamp stage because they have a warm sound. RUSSIAN DOUBLE TRIODE TUBE 6N2P-EV. This are high quality hi-durable, long-life ( > 5000 hours ) double triode tubes were made in USSR for the military equipment. Denon DJ SC6000M Prime. Vacuum Tube - 7025-WA, Tube Amp Doctor, High-Grade, Premium Selected - The TAD 7025 WA delivers full gain with smooth top end. 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 Fender. Tra l' altro la valvola 6C10 per me era introvabile. The 12AX7 was made for quite a while. Vous pouvez installer plusieurs lampes différentes dans votre ampli à la place des 12AX7. New Gain Tested Tung-Sol 12AX7 / ECC803S GOLD PINS Vacuum Tube. I swear, the 12AX7 and all of its mutant cousins probably has more mystique in its history than any other low level audio tube. The 5751 has identical plate resistance to the 12AX7, but the gain is 70 compared to 100 for. To reiterate: 5751 is a lower gain sub for 12AX7, and 7025 is a low-noise 12AX7 (same spec). The only claimed changes are lowered hum, lowered noise and microphonics (in some sheets). Really just depends on the tube and more importantly the tube compared to what you have currently. Any good GE or RCA 12AX7A or 7025 should give you nice, fat tone. Selected and recommended for guitar amps to improve overall response. ECC81 is 12AT7 medium gain pre-amplifying double triode. The right amount of clean gain for bass IMHO. This is the industrial version of the 12AX7. 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. I have not tried 7025 Long. It utilizes a medium length ribbed plate design that is much like the old Amperex and Brimar European designs. Tube Depot carries a selection of 12AX7 / ECC83 / 7025 / CV4004 Pre Amp Vacuum Tubes. Radio tubes are valves. So much in fact that a lot of 12AX7A's were labeled 7025's (a very quiet version of the 12AX7). 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. RCA made some good ones but I am getting ahead of myself. The chain of 12AX7's start to break up. 99: Buy Now: Result Pages: 1 2 Displaying 1 to 20 (of 39 products) Categories. Same grade as Ruby 12AX7ACZ HG. After the original 12AX7, additional variants were issued with various industrial numbers (including the 7025) as well the 12AX7A. The only claimed changes are lowered hum, lowered noise and microphonics (in some sheets). A 12AT7 is a lower gain tube from a 12AX7/7025/ECC83. Die Verbundröhre verfügt über zwei unabhängige und elektrisch identische Trioden-Systeme in einem Glaskolben. For use as 12AX7 an adaptor or an adjusted socket wiring for pin 2+3 and 6-8 is required. So do some of the Chinese 12AX7s. Unique spiral filament eliminates filament to cathode induced hum common on amplifiers that use AC on the filaments. New & NOS tubes from Tung-Sol, Electro-Harmonix, JJ & more!. Because the 12AX7 is so common, it's more sought after and as a result old stock models are more expensive. 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. Sovtekの12AX7-LPSはちょっと変わった内部形状。. ( 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. 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. and 7025 is the industrial name. It utilizes a medium length ribbed plate design that is much like the old Amperex and Brimar European designs. No microphonics issues at all. RCA 7025: Standard RCA vacuum tubes are available in large quantities on eBay. Παράδοση έως 30 ημέρες. The tube's detailed, musical tone rivals the most desirable NOS types. Perso, j'ai la chance d'avoir un gars avec lequel je peux tester en direct les 12ax7 que je vais mettre en en v1 et v2. Standard Delivery Times. Audio tubes for guitar amplifiers and audiophile equipment. google "12ax7 vs 7025": get responses like: In the old days the 12AX7 and 7025 were different quality tubes. 12AX7は、つい数日前に入手したBrimarが私には合いそうです。Telefunkenは全域に渡りフラットで優秀、でもちょっと音が硬い感じがします。Mullardは逆に柔らかすぎで少し暗いイメージ。Brimarはその中間で、お互いの良い所を併せ持った感じで良いです。. Best for clean tones as well as for those deep-bass required for modern preamps. The TAD™ 7025 Highgrade is a miniature, high-mu twin triode for the most demanding amp stages. 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. To the best of my knowledge, the tubes with numbers only i. Note that the modern Sovtek 12AX7WC is actually a pretty good valve. They are rare, coveted and sound even better than the Russian tubes. Nowadays tubes are not made this specific so the name mean almost nothing except on old tubes. TAD 7025 S - Mullard předzesilovací elektronka ECC83 12AX7. We carry a vast number of 12AX7 tubes to help you get the right sonic from your gear. 맨 왼쪽에 Amperex bugle boy는 교과서 같습니다. 12AX7, 5751 and 7025 tube reviews by John Templeton. For a comparison of all the 12AX7's we carry, click on the tech corner link at the top of this page. In many cases, these tubes are interchangeable and can easily be swapped. The 12AX7 Valve (or 12AX7 vacuum Tube) is a small preamplifier valve which is identical to the ECC83 - same valve, just a different name. Most SPICE model links are to Dave Cigna's stash of SPICE models provided by Francesco Piazza- these are marked DC. Produktsida Sovtek Bara ECC83 rör av Sovtek but also approximately 3 dB less gain than the normal 12AX7 (RT001) - recommended for problems with microphones. It has same specs as 12AX7A / ECC83 / 7025 but with different pinout for Pin 2+3 and 6-8 (see data sheet). I run 5751s in my 12AX7 slot and can hardly discern less volume. 7025: This is the low noise, "industrial" version of the 12AX7. 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 12AX7A seems to have appeared in 1960. 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. Η συγκεκριμένη λυχνία είναι δημοφιλής σε εφαρμογές ήχου όπου. 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. So a NOS 12AX7 with a suffix starting with 'W' is a military valve. "The Type 7025 is identical to the 12AX7 except for improved noise and hum characteristics. Best for clean tones as well as for those deep-bass required for modern preamps. 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. TAD 7025 S - Mullard předzesilovací elektronka ECC83 12AX7. See our Best 12AX7 Review for more information. 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). Given the gain, it is generally very low noise and microphonics. ECC83S is 12AX7 high gain pre-amplifying double triode. For use as 12AX7 an adaptor or an adjusted socket wiring for pin 2+3 and 6-8 is required. Karel De Reus † #N#ECC83: Peter Roggenhofer. Post76影音玩樂平台 入門小知識 12AX7/ECC83 靚膽大比併. It has two identical triodes both of which have a high voltage gain. ☆ 電圧管 12ax7(ニッケルプレート) ei製 sovtek製の12ax7lpsによる音の違いを味わってからは、もう止まりません。12ax7はとても多くのメーカが製造しており、価格も手ごろで入手し易い球ですので、色々違い楽しみたくなってしまいました。. Άμεση παραλαβή / Παράδοση 1 έως 3 ημέρες MusicAccessories. These don't appear to light up because of the spiral filaments, please listen to your amp before emailing us about a DOA tube!. Recommended for the 1st gain stage. They are normally very quiet, too. I like Brimar CV4003 or Westinghouse 12AX7 short plate with center bump. Il suono è fantastico e devo dire che tad ha dei prodotti di ottima qualita. Produktsida Sovtek Bara ECC83 rör av Sovtek but also approximately 3 dB less gain than the normal 12AX7 (RT001) - recommended for problems with microphones. It's just that an NOS 12AX7A tube is considered to be premium over the 12AX7. Review – Mullard CV4004 / 12AX7 Reissue. European number is ECC83. Even the standard types made in Heerlen (shown in the first two pictures on the left side and labelled Amperex, Valvo, Philips a. The gain is the same. Best for clean tones as well as for those deep-bass required for modern preamps. Fue comercializada al público con el nombre de 12AX7 el 15 de septiembre de 1947. Preferred Series 7025 / 12AX7. JJ Electronic ECC83S / 12AX7 / 7025 [15-400-14643] Η λυχνία ECC83S ή 12AX7 ή 7025 είναι μία διπλοτρίοδος υψηλής ενίσχυσης τάσης με βάση 9 pin τύπου Noval (B9A). 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!. 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!. The standard is VERY high quality/.