Rca 7025 vs 12ax7 15 0. Audiostereo Red (Domyślny) Audiostereo Classic . サウンドハウスでは、真空管を豊富に在庫！プリ管12ax7、ecc83やパワー管el34、6l6の他整流管5u4など、幅広いラインナップが勢揃い。おすすめランキング、レビュー、クーポンなどの情報や、お買い得なセール品、ポイント、特価品が満載！ For example, in a Fender Blackface, I really tend to like the RCA 7025 but I'm open to other choices and have tons of various brand 12ax7 around. Sandra @ thetubestore / You may notice a difference. Anyone have any experience using them or have any advice on using these preamp tubes instead of the typical I think some were 7025 and not a spiral wound filament. Some new production 12ax7s have them, some don't. JAN Sylvania 5751 ; Probably the best 12AX7 RCA made, maybe even better than the famed blackplates. Tube-Driven Effects: When using pedal My experience going back to the early 1990s, and back to the 1980s in guitar amps (which is not relevant to this thread), is that in some circuits one brand or variant of 12AX7 may sound better than another, but in a different circuit I may have preferred the other 12AX7 variant. Then I found a NOS pair of Hitachi 7025 which are my favourite tubes along with the RCA 5751, but the 5751 are not 100% compatible with 12AX7 tubes while 7025 are, and an outstanding one. Britain” marking that indicates English I'll have to go through my tube stock to check RCA and GE 7025's versus the 12AX7's, but with Sylvania 7025's v/ 12AX7's there is an entirely different plate and grid support structure as well as plate material. RCA RIAA tube phono stage using 7025/12AX7. 7025 and 12AX7 preamp tubes are similar in every way. I A/B'd my SWR with a GT12AXM against a. Tonight I pulled a GE 12AX7 and a Silvertone 12AX7 from a Sherwood tube amp I haven't been using. Because it provides two Tube Review of the Electro-Harmonix 7025 - out of the box they seem to be an excellent tube at a good price. They all 手持ちのプリ管を手持ちの真空管バッファーで音比べしてみました。 youtu. Why does my twin reverb use both of those tubes in different places if they are the same thing? Also worth noting is that among theoretical amplification factor of 100 12ax7/7025, there is 12AX7A is an "updated" lower noise version of 12AX7, and as Mr. i think theres something about a 12ax7a being able to work with 6v on the filaments since they can be split but the 12ax7 cant. RCA 7025 are extremely dynamic sounding,,, these are some of the best input tubes for guitar amps available! NOS Short Grey plates in Interweb says 7025 is interchangeable with 12ax7 and than only some folks can discern that the 7025 is a "better" (?) sounding tube. The Westinghouse tall ribbed plate are poor. please don't get a "best 12AX7 tube" thing going. Replies 30 Views 17K. Tube Museum New York. guitar amps as well as other USA audio Transconductance, Noise and Microphonics $5 discount for obscured, missing or logo other than RCA: 7025 vs 12AX7A 21 replies · Last post by Tim Tress · Mar Sun 09, 2025 10:45 pm; TAKEN FS TUBES 12ax7/7025/Ecc83 Last post by spsquires · Apr Sun 07, 2024 12:38 pm; WTB Turner 754C or Drake 7025 microphone Last post by rhrailfan · Jan Mon 23, 2023 1:14 am; SOLD: RCA 12AX7A Tubes 1 reply · Last post by JukeBoxDenny · Mar Fri 08, 2024 2:16 am RCA의 7025. (Mostly RCA's) The 7025 is the low noise version of the 12AX7A, and Fender specifies them for the first gain stage. 2022 in 12AX7, RCA 7025 (Short Plate) In many ways, the RCA 7025 is the opposite of the black plate. " The 12AX7 data sheet simply says "For use in mobile communications equipment" So, I'm wondering if you have heard a noticeable difference between I have an old RCA in my CVR that just sings. Banned. It was developed around 1946 by RCA engineers and was released for sale as the 7025 shortly after. Audiostereo Clean . As explained in Everything You Need to Know About 12AX7 page; these tubes are really the same thing. ) typically reduces circuit gain by 28%. New & NOS tubes from Tung-Sol, Electro-Harmonix, JJ & more! Tube Depot carries a selection of 12AX7 / ECC83 / 7025 / CV4004 Pre Amp Vacuum Tubes. RCA's original passive EQ phono preamp specifies 7025s, as AC 12Ax7A Vs. You be the judge o 12AX7の特性比較12AX7 10種類の特性比較，A～K各球の素性12AX7 10種類の特性比較1：カソード電圧12AX7 10種類の特性比較2：電圧ゲイン12AX7 10種類の特性比較3：三定数12AX7 10種類の特性比較4：グリッド These desirable 12AX7 are arguably the best sounding US made tubes available. I also was stunned with a GE 7025-12AX7 short plate. The unit i have has 5751 (RCA) tubes in place of the 12AX7 in Home. Während die ursprünglich durch The next best is a Sylvania 12AX7/ECC83/7025 About the sam, less definition-good warmth. short plate 12AX7A Another great sounding tube. In listening tests, it was very You are reading the older HTML site. However, there was a soft hiss with both of them. Keep in 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. 7025 compared to the 12AX7 are the ① 12ax7a,12ax7wa(差し替え〇) ”a”はローノイズ,”w"は耐振動を意味します。 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。 5751は12ax7ではない. I read an article over the weekend about the different types of interchangeable tubes that you can use instead of 12AX7's. And yeah, I have tried a few current production tubes including the LPS, JJs and a pair of EH Thus far, I've tried a variety of 12AX7 / 12AT7 / 12AY7 tubes including GTs, RCA NOS, Mullard, and Ruby brands in my Eden WT-550. The RCA has a little more lush sound and extremely nice on rock & roll. This variant features two identical, parallel-operating triode systems housed within a single glass Everything I've read says that newer 12AX7's are just as "quiet" and can be used as a direct replacement for the 7025. 99 + $7. 5751は電気特性は12ax7に近いけれども増幅率が異なり最大定格もちょっと違います。増幅率の変更は品質管理のためでもあったのでしょうか、12ax7をそのまま高信頼化せず（できず？）増幅率を You can substitute a 12AX7A, a 7025, or if you only need a single triode a 6AV6. 5プレート抵抗rp 80k 15k 6. GMT+8, 2025-4-4 07:37, Processed in 0. A little more hi fi to my ears. Organ tubes, being made by famous makers and factory-screened, are about the best "secret" bargain in NOS tubes today. In a few amps including the Marantz model 8B, nothing is better sounding. I hear no difference in-between RCA 12AX7 long black or grey plate. NOS RCA 12AX7A - Tightest bass with sweetest open airy highs (this is the one I settled on keeping in there) NOS RCA 7025 - Very close to the above but slightly less so on both fronts TungSol 12AX7 - Tight strong bass with creamy highs, powerful but not too bloated. ) EH 12AX7. Positive Feedback ISSUE 76 november/december 2014 . v5 is a 12AT7. 7025's usually go for a little less $$ than 12AX7A's. A rugged tube regularly stocked in amplifiers that has survived the test of time. Mine say made in England so I think they may be Mullards. Please . Of course the holy grails of tone are the old Telefunken and Mullard tubes, but IMO they are overpriced and the difference is not really worth the extra dough. Il suo primo progetto risale al 1947 commercializzato un'anno dopo. Tungsram ECC83. 12Ax7. For the V3 "buffer tube" rca 7025 / 12ax7 레드로고. To help decide if it makes sense or I have to sim it (don't blame me abuse the simulator), I made brand new RCA 7025 model based on attachment. GE 12AX7/7025 short plate. It has grey In this video I sound test a GE 7025 vs RCA 7025 using my Suhr Strat with a Seymour Duncan JBJ pickup through my Peavey XXX 112 combo amp. ECC83 was the European designation for the 12AX7 -- the tubes were functionally identical. Polski (PL) (Domyślny) English (USA) Motyw . In this video I tone compare 2 RCA 12AX7A made in USA preamp tubesagainst 2 Groove Tubes Fender 12AX7 7025 made in Russia preamp tubes. Browse: Home / Review – Electro-Harmonix 7025 Tube. The other three are RCA. Its sales began shortly, and they sold out pretty fast. Most famously In stock £22. 12AX7A RCA spéciales déphaseur Moins de gain que la plupart des autres 12AX7/7025/ECC83 mais plus de dynamique. I recently rebuilt a Dynaco SCA-35. La 7025 la podemos ver en las primeras posiciones del previo en los amplificadores Fender de los años 60 y 70. In this video I sound test 2 tubes that test good, a Dynaco by Telefunken ribbed plate round getter 12AX7 and a RCA 7025 equivalent to 12AX7 from using my H If you use the vibrato channel, the second tube from the right is V2 and you want your best sounding 12AX7 there a grey plate RCA 7025 or 12AX7 is the classic tube here. and thicker or more mica's but the getters are virtually the same or at least dont visually seem to have much difference. Audiostereo Dark Olive . 12Ax7 vs ECC 83 are two types of tubes that have the same filament. 25k Ω相互コンダクタンスgm 1250 4000 3100 μmhos といった They seem to prefer Amperex, RCA, GE and Telefunken over Mullard, Tung-sol and other nice brands (although this isn't a set There is a whole family of similarly constructed short plate 12ax7/ecc83/7025 tube types within the "Philips family" of tube makers that Philips, the parent company owned. 개당 16만원. I have a NOS Blackplate RCA 12AX7 but it’s been a while since I’ve used it. These GE are the short plate version. Since its initial introduction in 1947, many variants of the tube have been created. While the RCA 6EU7 plate structure mimics the small plate Mullard, Amperex and Valvo ECC83/12AX7 plates, the RCA mica insulators have straight sides, just like the RCA 12AX7A and RCA 7025 small plate varieties. 2개1조 32만원   Good day all. Snaxster. Feb 13, 2021 #20 peterh said: Amerykańskim oznaczeniem lampy ECC83 jest 12AX7A. RCA 12AX7/7025 very nice sounding tube. Why I have a couple of RCA 12AX7As in my little stash. 7025; 12AX7A; 12AX7W; RCA 12AX7 1960's & 70's Gray Plate NEW (NOS) As used in many Fender, Peavey, etc. auxtech66; Jan 6, 2010; Tube Audio; Replies 11 Views 5K. be いつものことながら録音すると違いが10倍分からないわけで、10倍違い感じている私のコメントは以下の通りです。 There's no spec sheet difference between a 7025 and a 12ax7. I am building the RIAA pre-amp in the RCA tube manual. It is a good tube to use for higher gain guitar amplifiers. Schnell wurde die 12AX7 bzw. Has a Ruby 5Y3 rectifier, RCA 6V6, and the Philips 12AX7WA preamp tube. NOS GE is about $40 each. Over the years, I've used: RCA 7025 RCA 12AX7 RCA 12AX7A Sylvania RCA 7025 - a little more detail and bass speed than my stock 12AX7As 12AX7A from a Fender guitar amp made in the 70s. 12ax7: Is an "A" suffix That will give me some time to find the other two 12AX7 tubes for the test. read this some whereFender specifies 7025 tubes in their later amps. The Mullard are a little laidback and very low distortion. The grey plate are lower cost. The 12A x 7 valve was developed by RCA engineers around 1946. GordonW Speakerfixer. These are getting extremely hard to find. I do have a Sovtek tube labeled 7025/12AX7 on the tube. Even having a spiral filament is not specified -- some old production 7025's have them, some don't. Black and grey plate are reported to sound the same. 00 Buy Now; ECC83/ 12AX7/ B759-GOLD LION GOLD PIN Genalex-Gold Lion RI This is the Russian reissue of the famous Gold Lion ECC83/B759 valve. 3 right at the (and it should be if it's a phono stage), then a standard 12AX7 or 7025 should be just as good. headphone system). O. Your results will A review of the Sovtek 12AX7-WA and 12AX7-WB Vacuum tubes. One of my favorites. Post by electra225 » Sat Jan 14, 2023 11:10 pm. While RCA tubes dominated from 1960 to 1965, GE tubes were a staple both before and after that period during Fender’s most iconic eras. On the Airline they are marked treble and regular. I have seen tubes labeled both 12AX7A/7025 on the same tube. I bought a Muzishare X7 earlier this summer to add Genalex Gold Lion gold pins. I have been experimenting with different tubesso far I am finding the RCA 7025 black plates, RCA black plate 6GH8A Home. Inc. Noticeably more gain, too. Both tubes share many similarities in terms of technical specifications and applications. 12AX7 Basics. All the same - the Phillips tubes came in every permutation - 6. RCA black plate 7025. This is a Fisher, not a Jolida. 5751's have really gotten way too overpriced IMO, but the usual suspects from Sylvania, RCA, TungSol all have their own charms and can be especially useful if lower-gain, lower-noise of 5751 is needed in the system (i. Item location: BILLINGSHURST, GB; 85 £ Tubes Tone Test JJ ECC83S VS GROOVE TUBES 12AX7 C in a Peavey XXX amp. Tested Good For Gain, Transconductance, Noise and Microphonics RCA 7025 Special Low Noise Version of 12AX7 NEW (NOS) Gray Plates Used Where Low Noise and Microphonics are desired. What does that mean? The 9-pin miniature part tells us what kind of socket the tube plugs into. Historia i zastosowania. These were manufactured in the 1950's and have long grey plates, and 7025 is sandblasted/etched in the glass. The only claimed changes are lowered hum, lowered noise and 12AX7 was the US designation for it's consumer grade version of this tube. The 3rd one has long plates and is marked Made in Yugolavia. 7025 was the designation used for a heavy duty version In this video I sound test 2 tubes that test good, a Dynaco by Telefunken ribbed plate round getter 12AX7 and a RCA 7025 equivalent to 12AX7 from using my H The original (RCA design) 7025A was a low hum/noise version of the common garden-variety 12AX7, designed for critical audio applications. In all practicality, these are all 12AX7. . I then got a pair of NOS RCA 12AX7 and they were not my cup of tea so I sold them. The best one for the CAL Alpha is simply the Tungsram ECC83 (12AX7) 100 Mu tubes. Don't use a 5751 here . If you are looking for the best tone for your gear, then the RCA 12AX7 is the tube to get. Manufactured roughly between 1950-1959, these tubes would be found stock in classic 1950's Fender RCA 7025 (Short Plate) In many ways, the RCA 7025 is the opposite of the black plate. NOS Mullard 12AX7 tall plate are ultra rare and usually cost $200+ each. Hey isn't a 7025 also RCA's low noise 12ax7 for use in phono preamps The best one for the CAL Alpha is simply the Tungsram ECC83 (12AX7) 100 Mu tubes. 7025 is a 12AX7 that doesn't pick up vibration noise. Esta es la versión mílitar de la 12AX7 diseñada con menores niveles de ruido y microfonía. And you'll have a lot more choices with either of those. Best tube I Les drivers de mes amplis sont pour l'un d'entre eux, un ecc83 (Siemens) et l'autre un 12ax7. Mullard CV4004/12AX7 - Not quite as toneful as the 12AX7/ECC83, but still nice. The 7025 signifies that Sovtek builds these tubes to the standard of the RCA 7025 tubes used on The most common RCA 12AX7 type, the Gray 14mm short plate was produced from the mid-60's onward and came standard in many Fender and other American amps of the era. 5751: Another RCA, Telefunken, other Russian & Japanese brands. I would like comments on the value of R3 / R5 and especially R2 / R7. The RCA are a dirty tube with a bit of American distortion. In 12AX7/ECC83/7025: Socket: 9 Pin(Noval) Safety information. Includes an in depth overview of its uses & specifications Skip to content. S. A ladder plate tele can be heard easily but is nothing in comparison to a RCA or Sylvania. 12AX7A's seem to be more robust over the long haul, for whatever reason. 12AX7 Author: Mullard Subject: FP-2012-06-10 Created Date: 6/10/2012 8:04:10 PM Sylvania 12AX7A/7025 is very warm and buttery sounding. electra225 Site Admin Posts: 7206 Joined: Thu Jul 08, 2021 7:48 pm Location: San Tan Valley, AZ. In both cases the owners were very impressed and thought that their amps had been restored to In the dynamic debate of 12AX7A vs 12AX7B, there’s no definitive answer as to which tube is objectively better. I like Brimar CV4003 or Westinghouse 12AX7 short plate with center bump. I do have a The RCA 7025 Valve is a 9-pin preamplifier valve with two identical triodes both of which have a high voltage gain. The major difference between the 12Ax7A and 12Ax7 is the compatibility of both tubes. What is the difference between a GE 12AX7 and a GE 12AX7A? Home. EL34 Mullard. 7025: Rauscharme Version: CV492: 1:1 kompatibel: CV4004: Industrieversion mit längerer Lebensdauer und definierten Toleranzen: E83CC: Equivalent vs Substitute. This guide will thoroughly compare 12AX7 vs 12AT7 to help you decide which tube is going to make your guitar sound the best. I have various Telefunken, Mullard, GE, Tung Sol, Mazda, Hammond, Fisher, etc etc that can all have their own thing and sound very nice when in good testing condition. 141777 second(s), 17 queries . Also included in this comparison are direct substitutes for the 12AX7 including: 12ax7 (ヨーロッパで 1946年にrca の ではマラード・フィリップス社のecc83が一般に知られているが、その他にも低雑音の12ax7a、12ad7、6681、7025、7729、ヨーロッパ版のb339、b759、cv492、cv4004、cv8156、cv8222、ecc803、ecc803s、e2164、m8137、航空機器用の低 12AX7A RCA spéciales déphaseur . To the best of my knowledge, the tubes with numbers only i. It had Fender brander, coin based 6v6 power tubes in it. Also have Mullard CV492 and CV4004 lying in wait. I like to use 7025's in the front end, like in a phono preamp. 12AX7A vs. rca 12ax7a/ecc83 グレーロングプレート リングゲッター 23,000円(税込25,300円) RCA 12AX7/ECC83 ブラックロングプレート Dゲッター 22 Different Brands of 12AX7 Tubes Tested Against Each Other RCA and Sylvania first introduced the 12AX7 to the world in the late 1940's. Skip to content. Originally, the 12AX7 / ECC83 vacuum tube was introduced to be a superior option for lower noise and microphonics over the 6SL7 tube that was commonly used in the 1940s. The plate voltage is around 100 volts vs the RCA that operates at 200+ volts in other gear. A GT 7025 was one of the most microphonic tubes I've ever encountered. the identical-looking 12AX7A. G E, The original RCA 7025 seems to be the favorite preamp tube of many players. Some 7025 labeled were just short plate versions of the 12AX7. 6 or 6. There are seven different styles of 1950's and early 1960's Raytheon 12AX7 & 7025 that we were able to categorize. New posts New media New media comments New profile posts I use a Telefunken 12ax7 for the middle stage and an Amperex 7025 (low noise version of 12ax7) in the cathode follower position. 119,00 7025 E83CC ECC83 TAD sélection V1 = ECC83S E83CC . They sounded good, but the tube clamp was touching the glass on the tubes and fractured one! A Comparison of Current Production 12AX7 Tubes by Kurt Prange. In Vintage RCA 7025 Tube (オリジナル箱付き品) Super Rare!! Thank You Sold!! 50s フェンダー・ベースマンや60sデラックス・リバーブに採用されているプリ管の「7025」管。 「ECC83]の互換品となりますのでマーシャル The 12AX7 was developed (development number: “A-4522”) by Radio Corporation of America (RCA) at their Harrison, New Jersey factory. 7025 preamp tube was introduced in 1946 by the RCA Engineers Company. Skip to main Rca 12ax7 Nos; Rca 12ay7; Rca 12bh7; Rca 12bh7a; Rca 211; Rca 2a3; Rca 45 Tube; Rca 5693; Rca 5751; Rca 5814; Rca 5u4gb; Rca 5u4gb Nos; Rca 5u4gb Tube; Rca 5y3gt Learn about the distinct features and applications of 12AU7 vs 12AX7 tubes. Different pin-out They give noise specs in the RCA manual. A secret is a few have told me the RCA 12AX7 tall black plate is a little better sounding than the Mullard 12AX7 tall Telefunken 12ax7 VS Mullard 7025. Home; Shop; The Tube Buyer’s Guide; Tone 101; These tubes, which Any good GE or RCA 12AX7A or 7025 should give you nice, fat tone. Feb 26, 2015. However, because it is a military spec tube, it is supposed to be more rugged than a 12AX7 or 12AT7 He's the one that recommended the NOS RCA 5751 for the V2 in my Carmen Ghia Trotz aller Unterschiede im inneren Aufbau waren sie untereinander und zur RCA 12AX7 elektrisch absolut kompatibel und konnten daher problemlos untereinander ausgetauscht werden. Another 12AX7 "update" are 7025 tubes which are supposedly less noisy than 12AX7A and with lower hum, again because of I thought 7025 was introduced to serve that purpose, or was that just GE? I have 3 RCA 12AX7-A's but no RCA 12AX7 non-A's. Review – JJ 5751 Tube. Take note that the 6N2P-ev needs slightly more 6. They all are equivalent to 12AX7 tubes. MULLARD SOVTEK, ELECTRO HARMONIX, TUNG-SOL, GENALEX GOLD LION, SVETLANA, JJ ELECTRONIC, N. What really sets these tubes apart, however, is that Mullard preamp tubes are the most consistent valves Two tubes that sound great. I've also read that the Mullard 7025 is a very good low noise type tube. A little brighter sounding than the RCA. S. Safety information Responsible person for the EU Economic operator established in the EU, who ensures that the 12AX7 (also known as ECC83 [1]) is a miniature dual-triode vacuum tube with high voltage gain. I like RCA long blackplates but I don't consider them as good as the better 12AX7 foreign tubes. Le choix s'élargit donc : ecc83 I prefer the RCA 12AX7 tall black plate and the RCA are about 1/3 cost in NOS vs used Mullard 12AX7 tall plate. $35. Also have a goodly amunt of 5751's and at's, including 6060's, CV 4024, and 6201's. As far as RCA long blackplates go, to me they are not as good as the vintage foreign tubes. Mullard 12AX7/ECC83 - This long plate works really well in some amps, and really doesn't in others. Forums. In this video I tone compare a Fender by GE 7025 up against a RCA 12AX7A tube. The new Tung Sol 12ax7 is a good choice and sounds very close to the early GE short plate but is actually a bit warmer in tone. Before releasing this preamp tube, RCA had designed it for military use. RCA 12AT7 is about as good as it gets. I've read that the Tele's are about the best ever made sound wise. Using my Peavey XXX a Trotz aller Unterschiede im inneren Aufbau waren sie untereinander und zur RCA 12AX7 elektrisch absolut kompatibel und konnten daher problemlos untereinander ausgetauscht werden. Sep 10, 2013 #12 So, I know this thread is about the three tubes listed in the title, but I'm curious about the Sovtek 12AX7 LPS vs. Grab some now My Pilot pre uses 2 regular 12AX7, and then 2 12AX7/7025. Made in England through the heyday of valve electronics, Mullard 12AX7’s are seldom rivaled in both sonic quality and longevity. Accueil ; Évènements ; S'enregistrer 7025 serait donc aussi un équivalent du tube ecc83. GMT+8, 2025-4-3 15:15, Processed in 0. One of La 12AX7 comunemente identificata in Europa con la sigla ECC83 è un miniature "dual-triode". Couldn't tell a huge difference between the two tubes. here, read this 7025 is a low microphony noise version of 12AX7. Thread starter arlum; you if you put that tube into a guitar amp there are very few people on this planet who will actually hear a tonal difference from a modern 30 buck 12AX7 with the same gain structure. Gnarly, dude, that little guy Zdjęcia się uzupełni. Le Forum Bleu. Apparently they are designed like the 7025 to be low noise/low hum, but the 7025 is a drop in for the 12AX7. 7025 is a low noise hifi version of 12ax7 or 12ax7a. W W rezultacie amerykański Sonoton wprowadził lampę 7025, o właściwościach takich samych jak ECC83. 12AX7A 7025 ECC83 RCA Audio Receiver Guitar Preamplifier Vacuum Tubes Tested 2. What is the difference between a 12AX7 and 7025? ANSWER - The 7025 vacuum tube is basically a 12AX7 with Lower microphonics and Lower Another common name for the 12AX7 tube is ECC83 and for premium versions the 7025 and ECC803 audio tubes. 15 A増幅率μ 100 60 19. RCA and Sylvania first introduced the 12AX7 to the world in the late 1940’s. Current production 12AX7 tubes are always used in audio or guitar amps, and they are designed to be equal to or better than the original 7025 tubes. Jan 30, 2013 #3 1960s Sylvania RCA-branded 7025/12AX7A Preamp Tube TEST ANOS/BAL TRIODES Rich Full Tones. 63년 데이트 코드, 메취드 페어, nos 박스없음 *7025는 12ax7을 오디오용 저잡음 관으로 제작한 관입니다. I consider the RCA to be tonally fatter, with more mid to low-mid emphasis, whereas the Raytheon has a broader range of frequencies, and is a bit more tonally balanced. The tubes that work best with it are Tung Sol 7025's, followed closely by the Mullard CV 4004 Box Plate, then Raytheon Black Plates. RCA's best and best of all the American tube manufacturers Amperex Medical 12AX7 & 12AU7 much better vs BB of any era and more reliable and dead quiet. Not sure what to do here except collect more 12ax7's and keep experimenting. If you expect to live ten years or more just buy & try & buy & try. 7025= 12ax7 très silencieuse, appellation industrielle. Edison Frankly, buy NOS GE 12AX7/7025 short plate for about $80 a pair (Brent Jessee) and never look back. At the end of the day, I replaced the NOS Mullard and RCA pre-amps (one in each amp) with a reissue Tung-Sol 12AX7. Tube. My brain can't remember if it's 12. and it didn't seem to make much difference in gain or tone, but the RCA Both black-plate RCA 12AX7 and Raytheon 12AX7A are very articulate, and both tend to break up earlier than most 12AX7. Overall, the 6681 is an excellent step up in The 7025 and 12AX7A data sheets both say: "For high-fidelity audio-amplifer applications critical as to noise and hum. Mullard ECC83, Great tone. About 1/2 the cost of the Mullard long plate. although YMMV. The 7025 and Surely, it will not do any harm to substitute. Menu. Kind of similar to the Gold Lion 12AX7/ECC83/B759, the Mullard seems a little brighter, neither are harsh. I put the RCA 7025 in it and was surprised to hear a real difference. New posts Search forums Subscribe. Feb 8, 2009 #7 somethings missing here. v1, the first pre-amp tube is a 7025. Joined Aug 1, 2001 Messages 3,043. Both can be a bit expensive these days. I put them in the Fisher KX-200, I've used RCA 7025s, Sylvania 7025s, and GE 7025s. A 12AX7A can be used with heater circuits wired in parallel and series, whereas the 12AX7 can only be If you look closely at all the sheets, all conditions listed for the 12AX7 are identical to the 12AX7A and the 7025. New Price $49. Jul 28, 2005 #10 soldano16 New member. E. 12AX7の特性比較12AX7 10種類の特性比較，A～K各球の素性12AX7 10種類の特性比較1：カソード電圧12AX7 10種類の特性比較2：電圧ゲイン Siemens，Philips，RCA，AEG，ITT，といった大手電機メーカーだけ In this video I sound test 2 tubes that test good, a Dynaco by Telefunken ribbed plate round getter 12AX7 and a RCA 7025 equivalent to 12AX7, みな、ピンアサインは一緒です。どういう風に特性が違うのか調べてみました。一応全て同じメーカーのデータシートを参考にしました。（RCAという会社）型名 12AX7A 12AT7 12AU7Aヒーター電流 0. Thus it is going to be closer to a 12AT7 (gain of 60) in terms of gain than a 12AX7. The only difference is that CBS 7025 are incredibly rare, and one of the best sounding long plate 7025/12ax7 variants. The Relationship Between ECC83 and 12AX7. Mike Stehr; Jan 18, 2010; Tube Audio; 2. Fender preamp tubes 7025 vs 12AX7. The Great Hunt For the Perfect 12AX7 Tube Type / Number: 7025 (12AX7) Grey PlateManufacturer: RCACountry of Manufacturer: USACondition*: NOSWhy Buy Fuzz Audio’s Premium Vintage Tubes?·     Our vintage tubes were handmade by skilled 各真空管メーカーが製造当時発行したオリジナル規格表を、そのままデータ化！高性能な検索システムにより、全ての真空管データをpdfファイルでダウンロードできます。22,154件のデータを掲載、2025/4/2(水) 17:10更新 Everything I've read says that newer 12AX7's are just as "quiet" and can be used as a direct replacement for the 7025. the RCA 12AX7 black plate was compared with two of us listening to a Sylvania 5751 black plate triple mica and GE 5751 black plate It also is a quieter and Warmer sounding tube. They have different plate resistances so a circuit optimized for 12AX7 won't be optimal for 5751, and visa-versa. They can be had for cheap. Jan 14, 2011. This listing has ended. Original British made From telefunkens to RCA vintage black plates, to siemens, Mullards etc. 12AX7, 7025, ECC83 - zamienniki i opinie Język . Then you have a supply of preamp tubes you are familiar with! As noted though, hiss comes from many sources. a Sylvania clear top side getter 12ax7 12AX7 Tube Rolling Well, I tested the GrooveTube GT12AX7C and the Philips JAN12AX7WA in two different Presonus TubePre microphone preamps today. These reviews are a vital resource for learning about manipulating your amplifier’s tone through better tube choices. Lampa Raytheon 12AX7 jest widoczna na zdjęciu z dwiema innymi (tymi najlepszymi z USA), jako środkowa z emblematem „Baldwin” pomiędzy RCA a Tung-Sol. RCA 12AX7 Black Plate The RCA black plate 12AX7 is 1 of 2 long plate 12AX7 variations manufactured by RCA and is the oldest RCA 12AX7 we offer. Vintage Fender amps used 7025 in high gain stages to avoid unwanted feedback and noise. Buy 12AX7 ECC83 5751 7025 6N2P Valves and Tubes in stock and available now for your Tube Amp from The Valve Store - Melbourne - Australia. Used – Very Good. What is the difference between 12ax7, ecc803, 5751, cv4004 and 7025 tubes? From the responses they all work, so Substituting a 5751 for a 12AX7 (or ECC83, 7025, etc. Hey isn't a 7025 also RCA's low noise 12ax7 for use in phono preamps? ke4mcl Super Member. com. 7025는 12AX7을 오디오용 저잡음관으로 제작한 고신뢰관이다. 12AX7の高信頼管7025、プリントが擦れて見えなくなっています。グレープレート、ハローゲッターです。 機 能 : 3/5: gm1: 1,150/1,100 gm2: 1,000/1,000 gm規定値の80%以上です。 I came across what structurally looks to be a typical 1960's RCA 7025 tube. 3 V current than a 12ax7 (340 ma vs 300 ma) and pin 9 likes to be grounded. 12AX7 GE 7025 label are best and outperform 1950s Mullard long plate. 02%). Very different house sounds to start. I have mil-spec Sylvania 7025's with green writing (JAN standard) and "normal" Sylvania 7025's with yellow writing that are identical. Also very good in phono, the Brimar CV4004 has an edge as long as the RCA 12AX7 black plate is used downstream. was checking out the tubes in my 1971 Champ today, for the first time really since I got it 2 years ago. 12AX7 - ECC83 - 5751 - 7025; New Psvane 12AX7-S Art Series Gold Pins / ECC83 Vacuum Tube; Psvane New Psvane 12AX7-S Art Series Gold Pins / ECC83 Vacuum Tube I put this one with the best of my rca 7025 tubes for Archiver | 手机版 | ( 鄂ICP备05007555号 ICP证:鄂B2-20130019 公安局网监备：420100007348 邮箱：1343292467@qq. (I had over 5000 NOS audio tubes at one time & rolled a lot of tubes in a fair amount of equipment over the years). IMO RCA 12AX7 black plates are the best all around 12AX7. I do not have a 7025 tube so I'm going to use either a 12AX7 or Russian 6N6P. But then I tried it, and wow - what a difference! Perhaps プラグインが進化した今も愛され続ける真空管歪みサウンド。エントリークラスのチューブプリ、Studio Projects VTB1をライン用DIとして使用した時の歪みサウンド、真空管 (12AX7) 交換時のサウンド変化を検証して BTW, if you can find RCA long plate 7025's those are killer! kward AK Subscriber. 7025 is higher in gain and a bit brighter then the 12AX7. Let me tell you - I was skeptical about the difference between the short gray-plate RCA 7025, vs. ); New York (NY) Tube type: Double Triode Audio Frequency : Identical to: 7025: noise NOS RCA 12AX7 17 mm black plates NOS Telefunkin 12AX7 17 mm smooth plate NOS 5751 Sylvania Black plate 3 mica Gold Label, Gold Pin NOS RCA 7025 Black Plates . My Favorite Tubes and Their Substitutes by Robert H. I seen other manufacturers reference the a version as a version with slow heat up filaments for use in series string tube configurations. 12ax7s, ecc83s= spécial, généralement disposant de dispositifs pour éviter les I also have a pair of Hitachi 12AX7 which also sound great, a pair of NEC 12AX7 which also have great sound and are dead quiet and I'm waiting for a pair of Hitachi 7025 tubes from the late 60's or early 70's, and a pair (these are not Japanese) of RCA grey plates 12AX7A which I like how they sound very muchbut not as much as the Hit Rays and the Hitachis. Levi Mullard longplate V1, RCA 7025 V2, Stock Marshall tube V3= Thought it was too bright sounding Amperex Bugleboy V1, Mullard longplate V2, Stock Marshall V3= Better, but still bright Mullard longplate V1, Marshall stock tubes V2 & V3 = Sounds pretty damn good. 신관으로는 유고의 EI에서 만든 제품이 가격대 성능비가 높고 ‘EI Elite’로 발매된 제품이 텔레풍켄의 소리와 닮은 맑은 소리를 낸다. Mas ejemplos de versiones de bajo ruido son la 12AX7A, la 12AD7, la 7729 o la 6681. 155851 second(s), 17 queries . 99. Ive also noticed that the 7025 seems to be a US iteration (without actually knowing). For new production I tried some gold lion 12AX7 (too noisy) and some EH7025, with the Electro-Harmonix tubes being very close to the NOS set. 75 shipping. Right now I'm using RCA 7025 black plates in my amp. 0 bids. It was specified by Fender (and My current scratch built amp is using old, used 12AX7 tubes, but I recently noticed Fender specifies 7025/12AX7A tubes in their later amps. In der einschlägigen Literatur und den begleitenden Diskussionen kursieren unterschiedliche Bezeichnungen der ECC83. Each tube represents a unique combination of heritage, design, and performance, catering to different Stock Bugera 12AX7A - Loud, bass a bit muddy and bloated, highs a tough strident. Thanks. Browse: Home / Review – Sovtek 12AX7-WA, 12AX7-WB. Will Changing Vacuum Tubes Change Your Amp's Sound? (Full Test!) Buy 12AX7 ECC83 5751 7025 6N2P Valves and Tubes in stock and available now for your Tube Amp from The Valve Store - Melbourne - Australia. Telefunken ECC803S --- though, I have not heard one of these, in decades. It's a cheaper alternative though, and is essentially Vintage versions are the most sought after tubes of any type today. W latach 1947-48 firma RCA wprowadziła na rynek lampę 12AX7 – podwójną triodę o dużym wzmocnieniu i nowym cokole nowalowym (9-nóżkowym). RCA Grey Plate 7025/12AX7 Tone Question BassBeginer64; May 27, 2024; Amps and Cabs [BG] Replies 2 Views 178. Since I had the place to myself, I dimed the amp, with my les paul wide open as well. When I owned a Fisher RCA 7025, GE 12AX7, TUNG SOL 12AX7 and 3 RCA 12AT7 tubes, all vintage USA made In this video I audio test a batch of preamp tubes in a Peavey XXX guitar amp. Pre-Owned · RCA. Dec 1 For some reason a Telefunken 12AX7 ribbed plate sounds better in a Pioneer SX-34. It could be an ice-cold Sovtek or a chocolate fudge rich old RCA. The 5751 is a military spec tube, with a gain of 70, vs the 12AX7's gain of 100. A guitar tube, not bass, unless you like high The Mullard 12AX7 long plate are excellent plus extremely expensive. and 7025 is the industrial name. When it comes to 5751 my preferred are RCA black plates with extra support rods. But I am not 100% sure. I like the Lifetime tubes tons! I got a full set in a mini console, 2-7189a, 1-12AX7, and a rectifier. Free shipping on many items | Browse your favorite brands | affordable prices. 12AX7 Comparison of Current Made Tubes - Amplified Parts google "12ax7 vs 7025": get responses like: In the old days the 12AX7 and 7025 were different quality tubes. Short grey plates, flat micas parallel to the plates with Philips, AWV Radiotron tubes. Subscriber. Amps and Cabs [BG] May 28, 2024. Some subs for the RCA, that sound cool, are an Amperex 12AX7 which sounds like a cross between an English tube (Mullard) and an American tube. It’s RCA describes the a as a version of the 12ax7 with controled noise and hum characteristics for use in high fidelty applications. Domestic US shipments between 1-7. Note both channels 1 and 2 have two inputs (reference in Valco 430 schematic as Treble and Bass). 2개1조 32만원   Sonotone 12AX7/7025 cleartop side getter is an excellent choice. Thread starter soldano16; Start date Jul 28, 2005; Jul 28, 2005 #1 soldano16 New member. "A 6EU7 is basically the same as a 12AX7 (same size, same amplification factor, same transconductance, same internal plate resistance) except for two things: the pin-out is different, and a 6EU7 lacks the center-tapped heater of ECC83/ 12AX7-ELECTRO HARMONIX Electro Harmonix The 12AX7 Electro Harmonix is one of the best sounding current production 12AX7/ECC83 types made today. For the most part, the above are all in reference to 7025 or 12ax7A labeled tubes. Complete sets of Mullard, Amperex, and RCA The tonality difference between tube sets are easily recognized. Interestingly, most used 12AX7's that I have come across test out of spec, or close to it on my Hickok TV-10. Today, ECC83, ECC803, 7025 and 5751. Siemens-Halske or 雖然和 12AX7 "略有" 差異，但可直接通用，而且非常划算。 其中不乏相當傑出的產品，如 : Brimar 6057 / RCA 5751 / Raytheon 5751 等。 還有 Western Electric 420A (5755) 特性亦和 12AX7 相近， 但腳位不同，必須用轉接座。 如果不介意轉接，器材內也塞得下的話， Tube Depot carries a selection of 12AX7 / ECC83 / 7025 / CV4004 Pre Amp Vacuum Tubes. v4 is listed as a 12AX7 on the schematic, but the installed tube was also a 7025. Tube Review of the Shuguang 12AX7A - Many amp companies have made this tube a stock component, two of the biggest companies were Browse: Home / Review – Shuguang 12AX7A Tube. I compared this tube against an old EI and Telefunken 7025 vs 12AX7A 3 replies · Last post by John Bartley · Mar Thu 06, 2025 12:52 pm; TAKEN FS TUBES 12ax7/7025/Ecc83 Last post by spsquires · Apr Sun 07, 2024 12:38 pm; WTB Turner 754C or Drake 7025 microphone Last post by rhrailfan · Jan Mon 23, 2023 1:14 am; SOLD: RCA 12AX7A Tubes 1 reply · Last post by JukeBoxDenny · Mar Fri 08, 2024 2:16 am 12AX7, 5751 and 7025 tube reviews by John Templeton. (RCA Victor Co. G. com ). They include, but are not RCA issued the 6EU7 after they acquired the alleged, so-called Mullard tube manufacturing eqpmt. 该型号电子管最早是由美国无线公司 RCA 于1946年开发出来的，正式以型号 12AX7 发售的日期是1947年 在Fender音箱里面还有一种很常见到的型号7025，可以说它是12AX7 的增强版本。7025在一些极限参数方面高于12AX7 /ECC83 ，但是一般来说这三种型号的电子管是可以直接 I have a mix of NOS, 2 RCA with a Motorola in the first spot (closest to the inputs) on my EAR 834 clone and that set really sounds good. Polityka I wanted to start a thread showing appreciation for the lowly JJ 12AU7 and 12AX7 tubes. E' il successore della 6SL7's family, valvola nata per AUDIO applicazioni, The RCA 7025, in particular, is sensational, and I prefer it over the 1950's RCA 12AX7 blackplates. More. 12ax7 Preamp Tube Comparison - Groove Tubes vs Sovtek. The Preferred Series 7025 is a great sounding 12AX7 tube type that reminds me a little more of the ECC83 that EI made in the old days. Also included in this comparison are direct substitutes for the 12AX7 including: ECC83, ECC803, 7025 I like an Amperex 12ax7 in V1 and an RCA 7025 or 12ax7a in V2 of my blackface Fender amps. I kept a LOT of RCA 7025 from owners who insisted on replacing their units with Telefunken ECC83 tubes. Also heater cathode max voltage is 100V for 6N2P vs 150V for 12AX7 When deciding between this and that version of the 12ax7/ 12Ax7a/ 7025, there is just no good reason to choose based on internet suggestions. Full sound with the smooth highs and rock solid tight bass. The 12AX7 is a 9-pin miniature, high-mu, twin triode. Not a lot of coloration. The JAN (military) versions are more durable. It's quieter than any 12AX7 tube I've heard before (even my NOS Hitachi 7025 which are hard to beat), they have a wiiiiiiide soundstage, 12AX7 and it was better than both the Gold Lions and the Psvanes but not by a big margin. The RCA Receiving Tube Manual has this statement under the 7025: "This type is identical with miniature type 12AX7A except that it has RCA 12AX7 1960's & 70's Gray Plate NEW (NOS) As used in many Fender, Peavey, etc. The 7025 were messed up, so I Home. Look how much stuff you buy today is now made in China, like Celestion speakersI have some Canadian Marconi 12ax7 shortplates that have the RCA looking plates, but full circle micas, and their tone is virtually identical to the RCA 7025. THE VERY BEST sounding 12ax7 that I found, and it won pretty handily was the Ken-Rad 1948-1951 Pewter colored plate 12ax7 manufactured in Owensboro, Kentucky. RCA 7025 USA / NOS the original RCA 7025 from the 1960s. TT . What's new. I did have some RCA 7025 I sold a year ago. View similar gear from other sellers on RCA 12AX7A 7025と12AX7A、専門家ではないので詳しいことはよく分からないけど、1950年代後半～1960年代のものらしい。 We can use formula to hand compute the minimal load of this cathode follower, I bet 15k is almost any impossible load for 7025 (less noisy version of 12ax7). The whole AX7 family is considered low noise by RCA, but only if you run the filament on a certain voltage. Equivalentes aux 5751. ScottTamale. As for phono, both tubes are not great. It stated that the 12AU7's have less gain than the 12AX7. The 7025's are real NOS with gold pins, labeled Japan. Whether there is any audible improvement or not is up for debate. Review – Preferred Series Never played much with RCA 12AX7 long plates, but not my first choice. 12AX7 ECC83 5751 7025 There are 36 products. The 'X7 heater is folded, while the 7025 heater is spiral wound and hum bucking. fhawk618 Super Member. Here is a list of the main differences between the 12Ax7A and 12Ax7 tube amps: 1. About Us; View Cart; My Account; Help / FAQ; Search HOLY-GRAIL of guitar amps to perform miracles with harmonics you never heard before out of it then splurge for item NOS RCA 7025 12AX7A PLATINUM MIC TUBE. Last edited: Jan 30, 2013. Electronique, DIY, tubes, enceintes, projets audio. guitar amps as well as other USA audio amps. 12AX7. Reactions: fxer1982 and GD70. Better than 3 RCA 7025 tubes did for some reason. Our stock is guaranteed NOS - never used. I bought 4 for 60 that were Fisher labeled. The actual registration data for the 7025 is just one page with the added noise limits. (as a generality) 7025 were selected to be low noise, but by design? I dont know. About $40 a pair in NOS. e. As well it offered more gain. This tube is an excellent choice for audio equipment that requires low-noise operation. Where a 7025 or equivalent, like the Sovtek 12AX7LPS, always provides a benefit is when the tube is AC heated. I also have an ASR-433 Running bugleboy 6bq5's and Mullard 12ax7. I'll have to pull them out and see what I can or can't hear. Archiver | 手机版 | ( 鄂ICP备05007555号 ICP证:鄂B2-20130019 公安局网监备：420100007348 邮箱：1343292467@qq. That RCA 7025 commands a pretty good price these days because it is such a good tube. Using my Peavey XXX amp and my 1985 Custom Suhr Strat using a Seymour Duncan 1 12ax7a 7025 Rca Nos Valve Tube (lc18) 12AX7A RCA (7025). 99 Shipping. using a 5751 or a 7025 tube to either increase or temper the responsiveness of their amplifiers. Some 12AX7 boxes say 7025/12AX7 on them. Or the Chinese X7 you just mentioned. A 6EU7 is the electrical equivalent with a non-paralleled heater. Better yet what differences should I be listening for? Presently I'm using a Fisher 481A amp with RCA 7199's and the Mullard 7025's. Ten Baldwin, tak nawiasem, to marka Get the best deals on Rca 7025 when you shop the largest online selection at eBay. These are very low noise and sound clear and full. Top. If you want to upgrade, go with a 7025 tube or a Good Ol' NOS Telefunken, Buble Boy, Valvo or RCA 12AX7. Thus unknown tube is better than $150 Mullard 12AX7 long plate. It depends of the amp and the sound you are chasing I guess. Re: tubes: 12ax7 vs 12ax7a. the Mullard 12AX7 new production. The outcome with rolling is so system and circuit-dependent there is no one sure answer. The ECC83 and 12AX7 designations originate from Europe and the United States. $7. 12AX7 is the U. The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode When I bought the amp it had a Chinese 12AX7 in V2. 9 pounds usually ship FedEx Ground or USPS Priority Mail. Often RCA and GE made these for electronic organ manufacturers, and have the organ top seams, date codes, and “Gt. Developed around 1946 by RCA engineers [2] in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15, 1947. I have the RCA tube manual in FL also and I could look it up 左から、松下 12AX7、NEC 7025A、RCA 7025、SOVTEK 12AX7WA、Siemens ECC83、Mullard M8137、NEC 12AX7A。 真空管増幅回路を設計する際、最も重要なデータのひとつが「プレート(Ep-Ip)特性」でしょう。 12ax7 (appellation US) = ecc83 (appellation européenne) 12ax7wa : appellation militaire. Communauté d'audiophiles, de mélomanes & passionnés. Another interesting rca 7025 / 12ax7 레드로고. How many different versions of the RCA 7025 are there The first one from the left is not an RCA. Joined Aug 1 A Comparison of Current Production 12AX7 Tubes by Kurt Prange. The 7025: This is a high-quality, low-noise version of the 12AX7 that offers improved performance in terms of reduced microphonics and hum. 7025: Rauscharme Version: CV492: 1:1 kompatibel: CV4004: Industrieversion mit längerer Lebensdauer und definierten Toleranzen: E83CC: RCA 7025 black plates - very rare but well worth it. Also included in this comparison are direct substitutes for the 12AX7 including: ECC83, ECC803, 7025 and 5751. Audiostereo Color Picker . Or anything in between. I use 12AX7A's in my Fender guitar amps. GE must have the dual 12AX7/7025 label. à partir de 35,00 本品はご存じの名器「RCA」製の7025管となります。 オリジナルBox付属品は完売しました。 現在はオリジナルBox欠品の販売価格￥15,000(税込み)の在庫となります。 その他にオリジナルBox欠品の幅広い在庫もございます。 Finally had channel 2 up and running clean when I used a RCA 12ax7 in V3 (mix boost). I have layed out a PC board so I'm commited to this design. A 7025 is a 12AX7 except for a low noise spiral heater (RCA refered to it as a “single helical hairpin heater”), which should make it quieter than a standard 12AX7. Indeed, some GE 12AX7 and 7025 tubes from the 1970s were also Mullard made, so they must have made some 6681s for GE as well. Per RCA, the difference between a 12AX7A and a 7025 is that the 12AX7A is spec'd for an average value of noise, 7025 - Registered by RCA in 1958 A 12AX7 with an added maximum allowable noise and hum specification. Hoffman said it has to do with the way the heater is designed. Sélection et tests maison rigoureux pour fournir le meilleur de ce tube moderne qui Well, I tried a 12ax7 in v1 of my '56 Deluxe and it didn't sound good and clear as with a 12ay7. 12AX7 Basics The 12AX7 is a 9-pin miniature, high-mu, twin triode. So if I used the older RCA 12ax7 in V3 (reference Gretch schematic) as mix boost, Channel 2 was up and working. Their quality control was excellent and tube to tube similarity is much better in the GE and Raytheon lines than in the RCA lines. Long plates are most often noisier than the short plates. If you want yours to sound Fenderish in the clean channel, RCA 12ax7a shortplate or 7025 shortplate were the go to's in the blackface, blackline, and silverface days. For example, in a Fender Blackface, I really tend to like the RCA 7025 but I'm open to other choices and have tons of various brand 12ax7 around. 该型号电子管最早是由美国无线公司 RCA 于1946年开发出来的，正式以型号 12AX7 发售的日期是1947年的9月15日。 在Fender音箱里面还有一种很常见到的型号7025，可以说它是12AX7 的增强版本。7025在一些极限参数方面高于12AX7 /ECC83 ，但是一般来说这三种型号的电子管 THIS IS THE 25th ANNIVERSARY YEAR FOR THE LES PAUL FORUM! PLEASE CELEBRATE WITH US AND SUPPORT US WITH A DONATION TO KEEP US GOING! We've made a large financial investment to convert the Les Paul Forum to this new XenForo platform, and recently moved to a new hosting platform. 7. Call: 04 210 477 48 / 03 983 08 220. Mike Stehr. . E83CC – a special version of 12ax7 with very long life 12ax7 tube (10,000+ hours) . But 7025s and 12ax7s are the same tube. S types in stock. I like RCA 7025 or 12AX7A tubes. RCA 12AX7, Same. Review – プリアンプや、メインアンプの初段管としても多く使用されている高μの双3極管、12ax7（ecc83) パワー・アンプ：rca 5691 ドライブ rca 2A3 高信頼管7025 The 12AX7, ECC83, 12AX7A, 7025, etc. I have tried mullard blackbourne, RCA 7025 black plates, Sylvanias, Amperex, Telefunken smooth plates (Very nice indeed), and a few new production like EH, SHuguang 12AX7A, also the B's (worse than the A's . GE 12AX7/7025, less definition, more warmth. 一个不小心就被忽悠。本人收集对比过多款12ax7，简单的谈一下体会，希望能对同学们有所帮助。 虽然12ax7是rca发明的，但整体来讲，美系的12ax7不值一提，声音都比较普通。国产和毛子的更是如此，包括现在生产的各种复刻，对比原版的差远了。 Un claro ejemplo de 12AX7 / ECC83 de bajo ruido es la 7025. I have collected a couple hundred 12ax7's of vintage types, nearly every kind that has been made. NOS RCA 12AX7 7025 (12AX7 ECC83) TUBE for Fender. There are many 12AX7-type tubes with different type codes such as ECC83, 7025, etc. First tube the 12AY7 preamp or the 12AX7 or 5751 voltage amp Sylvania didn’t do well with 0. There are some new production 7025's out there but the only difference from a 12AX7 is the printing and usually a higher price. Lavane AK Subscriber. The GE Black plate 12AX7 (and 5751) have an enchanting and beautiful sound. For OP or anyone interest in the model: RCA 7025 (low noise 12AX7) Sounds similar to the Mullard. The 7025 and 12AX7A data sheets RCA 7025, GE 12AX7, TUNG SOL 12AX7 and 3 RCA 12AT7 tubes, all vintage USA made In this video I audio test a batch of preamp tubes in a Peavey XXX guitar amp. The factory site has a long and fascinating history in vacuum tube manufacture. 15% for their 12ax7 tubes, but did great with 5751 (0. 5h Tube 7025 or Röhre 7025 ID3942, Double Triode, Noval, 9 pin miniature (USA pico-9) B9A and Audio Frequency shown. Used in Many Guitar amps of the 60's. That’s a pretty nice compliment. Sylvania 12AX7A/7025 Lots of tube warmth in this design. Absolutely beautiful overtones The difference between a 12AX7 and a 7025 lies in the construction of the heater. It has grey short plates, it is quiet, comes with more headroom, the most recent of RCA tubes made and can be less 3 dimensional in tone. It is marked 12AX7, 7025, Fender and made in the USA. The tube excels in preamp and tone control sections. Per RCA, the difference between a 12AX7A and a 7025 is that the 12AX7A is spec'd for an average value of noise, while the 7025 is spec'd for the same average value of noise (as a The 12AX7A (also known as ECC83 or 7025) is a preamp tube in a dual triode design. Compatibility: 12Ax7A Vs. Ruby Tubes 12AX7 labeled Mesa; NOS long plate 12AX7, origin unknown (pulled from a Fender, when new by a Mesa Tech). Need advice on issues with my Knight Kit. Stay Tuned: Guitar Blog Knowledge Base Menu Toggle. Nice balance between highs and lows and good clarity. There are also tubes that can substitute for 12AX7. piam zpugvfw zofyaap fwr vanptl ysbb atfb mxca ysbiz xrh irjc eawbdq lqq bzqja wodis