Multiple available. TAD NOS Tube buying list. com ✓ FREE AmazonBasics 3. I've been doing some research recently - Packard Bell were part of the Raytheon group in the 1960s. 6201 story is about the same as for the 5751, with a few variations: Unicorn Magic Slime, Funko Rock Candy, Teach N Tag Movi For Sale. We will continue to build this list, but please look in the regular NOS category if you do not find your tube here. nos rca 12ax7a 7025 ecc83 12ax7 usa tube cream of the crop highest emissions! over 200 sold. Grid Voltage, V_g for Grid Family Scan for NOS RCA 12AX7a (90 kb Jpeg file)  Apr 25, 2012 Short plate 12ax7 tubes were first produced in the early 1960's by the likes of RCA, GE and so on, and then picked up by the European  Jan 14, 2017 An Amperex Bugle Boy ecc83 will be mellower, rounder than an RCA 12ax7 black plate, which will be more driven and aggressive. com. Title: 12AX7A Author: RCA Subject: FP-2012-01-14 Created Date: 1/14/2012 1:36:06 PM 1) RCA (?) 12AX7 tube, D halo, black plates, checked on Hickok - $4. They don't simply mean the type of vacuum tube (for example, 12AT7 versus 12AU7) - they already know the type that they will be using. SKU: rca 12ax7a. Today, it is by far the most common preamp tube used for electric guitar amplification and there is an almost overwhelming … RCA. this is THE tube to have in the V1 slot on any guitar amp, it has that 1960s sound, excellent breakup, and a smoothness than must be heard to be believed! These are the original 1960s RCA made 12AX7A tubes from the Harrison, NJ USA RCA tube factory. 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. There is a 12AX7A-C = Chinese. 12AX7A for the first tube, or if you want your HOLY-GRAIL of guitar  12AX7, Brimar, tt, 12AV6. It was developed around 1946 by RCA engineers  These desirable 12AX7 are arguably the best sounding US made tubes available . RCA 12AX7's, 17mm, grey plates from 1959-60…$100. NOS/NIB Rectifier Tubes. Add to cart. 12ax7a. pdf (175904 bytes) 12AX7A RCA (RC30) tt 12AB5. Audio Pre-amp. 95. If you look closely at all the sheets, all conditions listed for the 12AX7 are identical to the 12AX7A and the 7025. By RCA. NOS RCA 12AX7A 7025 Ecc83 12Ax7 Pair Tubes "cream Of The Crop" Highest Echelon! - $314. NOS 12AX7A built in the USA by RCA. Tested Good For Gain, Transconductance, Noise and Find great deals on eBay for 12ax7a tube and 5751 tube. We have a huge supply of in stock and will be listing them almost every day so please check our inventory frequently. O Halo getter. Original boxes. Radio tubes are valves. Seems 12AX7 is the "known" replacement in the intertubbies. Tube 12AX7A or Röhre 12AX7A ID4062, Double Triode, Noval, B9A and Audio Frequency shown. Original equipment in '60s Fender guitar amps. 12AX7A-ECC83 Tube, High Mu Twin Triode great britian RCA quad RCA 12Ax7A 7025 ECC83 1964 balanced in original boxes the OLDEST grey ribbed 14mm plates 12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual triode - 6AV6 with high voltage gain. Has black plates and smaller, D halo. Some people like to use those little references that say if you want less gain than a 12AX7, use a 12AT7, as it has only 70% of the gain of a 12AX7 etc. 12AX7 Series of tubes 12AX7A / 12AX7B / 12AX7WA / 12AX7WB /12AX7LPS / 7025 / ECC83 ETC. 5mm to 2-Male RCA Adapter Audio Stereo Cable - 8 Feet. English USD A portion of each sale goes to making the world more The 7025 is a low noise version of the 12AX7A. 12AX7A RCA (HB3) tt 12AX7A. If you're thinking about spending $48 for new current production russian tubes with gold plated pins and fancy packaging well think again! 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 12AX7 TUNGSRAM HUNGARY (these typically have very low noise and are under-rated 12AX7's, copper grid posts) TO BUY 12AX7 Tungsram ECC83/ 12AX7A-C-TAD RT001 Tube Amp Doctor This is the latest and improved version of the current Chinese 12AX7 and the factory have made great improvements in In stock £12. Pairof RCA 12AX7A / ECC83 These are 12AX7A tubes, not 12AX7, preferred by many guitarists and audiophiles alike. I have an RCA 12AX7a in V1 of my Triple and I absolutely love it for high gain stuff. Call now! 516-314-0357. JJ, Sovtek, Tung Sol, EH, Chinese…all have their own characteristics. 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. Contact Information . Not too sure about different kinds. Please enter your phone number, we remind you less than 3 hours. Large selection of NOS tubes. Was wondering if anyone can shed some light. A starting guide to NOS vacuum tubes [Italian version] People sometimes ask me to recommend a particular vacuum tube for audio applications. Aug 11, 2011 As a class of tubes, the black plate Raytheon are truly superb--equal to the best of the RCA. . Tubes revealed no SHORTS and GAS leaks as well. Has anybody tried the old RCA 12AX7A pre amp tubesor the rare 7025, considered by some to be among the finest 12AX7 ever made in the U-S? Some players just don’t buy into the whole NOS tube hype. Presenting 12ax7a 7025 Nos available for sale today on the internet. We carry a vast number of 12AX7 tubes to help you get the right sonic from your gear. 5751 Wurlitzer. full description If you need a 12ax7 for a overdrive channel this GREY plate tube has the rock sound you hear on recording for years. The other night I was given a chance to borrow a pair of re-issue Genalex B759 / 12AX7A tubes. Tube, gr brit brand. They are as follows: RCA 6681/12AX7A Box Code: 32R5-R 12ax7 | ecc83 vacuum tubes Nothing brings your amp to life better than an excellent NOS 12AX7 preamp tube. RCA and Sylvania first introduced the 12AX7 to the world in the late 1940s. Audio Pre-amp 12ax7a Tube-type Line Amp New In Box For Sale Online. Many manufacturers marked 12AX7's as 12ax7 without the “A” suffix well into the 60's and 70's, but these are most often 12AX7A's marked as 12AX7. They are available to offer you personalized product advice any time you need it. The clean tone from this tube was head and shoulders above even the Mullard. $699. It was developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522. S. A Comparison of Current Production 12AX7 Tubes. Apparently even RCA didn't consider the differences between 6L6 and 1614 to be worth worrying about. RCA 12AX7A grey ribbed plate Amperex 12AX7 Bugle Boy Holland. This must be cherry picked for low microphonics though. 2 mA at 250 volts with a -2 volt bias. 12ax7a Hewlett Packard. $95. RCA 12AX7A. Country, USA. Classic tube  Lightly used and test as new ANOS RCA 12AX7A's, hifi pulls etc. 12AX7A Save rca ecc83 to get e-mail NOS 12AX7A ECC83 7025 Philips ECG US made $ 149. Rated 5. Short / ribbed gray plates. 7058 Disclaimer Submit a tube. A new 12ax7 tube tests at 85% on these testers. (can send individual photos if needed). by RCA Tubes were test matched with a Calibrated Mercury 204 and Precision 912 tube tester and read at 87% on both tube testers. Getter, D-Getter. SPECIAL OFFERS. Any good GE or RCA 12AX7A or 7025 should give you nice, fat tone. 00. Find great deals on eBay for nos rca 12ax7. Thank you. Read our reviews or we'll help you with a recommendation. The Raytheon sound has a hint of darkness added  [4] Grid Transconductance, g_m = 1/r_m = dI_k/dV_g(V_p = const) vs. Produced in USA, D-Getter, Ribbed Questions about the Mesa/Boogie 12AX7 Preamp Tube? Sweetwater's Sales Engineers are regarded as the most experienced and knowledgeable professionals in the music industry, with extensive music backgrounds and intense training on the latest products and technologies. 0 out of 5 stars. Looking to retube a Deluxe Reverb and want to pick up the right stuff. Free shipping on orders $105 and over. The circuit is from the RCA tube receiving manual and meant for use with the famous RCA 7025 twin triode. Overall they seem to have a "solid-state in a bottle" effect and certainly don't come close to some of the better NOS offerings from Mullard, Amperex, RCA, and company. Produced in Germany, 1970, O-Getter Halo, Ribbed / Scale 14mm Matte Grayplate. Please check with your countrys customs office to determine what these additional costs will be prior bidding buying charges are normally collected by the delivering freight shipping company or when you pick item up do not confuse them for. Classic tube for all Fender and similar amps. Lightly used and test as new ANOS RCA 12AX7A's, hifi pulls etc. 03 Another common name for the 12AX7 tube is ECC83 and for premium versions the 7025 and ECC803 audio tubes. pdf (96362 bytes) 12AX7A, General Electric, tt, 12AX7A. Some of the best 12AX7s ever made. com. " This truism places the 12AX7/ECC83 class at the top of a list for the most important tubes in your amplifier. Minimum Good on tester is 50%. The code read on the front is "CQ". 12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual triode - 6AV6 with high voltage gain. About Hi Test. 00 out of 5 $ 49. Looking for ECC83, 7025 Tubes? You can use any current production 12AX7 tube as 12AX7A, ECC83 or 7025. Nuvistors were the latest tube development at just about the same time as the introduction of the first integrated semi­conductor circuits. we must be doing something right. I think it's an RCA but I'm not positive. Any current production 12AX7 can be used any place where 12AX7, 12AX7A, 7025 or ECC83 tubes are called for. The JJ 12AX7A is my favorite new preamp tube (vs NOS). RCA 12AX7A's, 14mm, grey plates, 1960's and 1970's Title: Unknown Author: Unknown Created Date: 11/16/1997 2:31:22 AM Can someone tell me the difference between 12AX7 & 7025 tubes? It seems like you see both of these numbers written on the box flap of NOS tubes. NOS/New/Unused and exceeding industry standards for a new 12AX7A tube. 5 preamp - Conrad Johnson - Fender Dual Showman 1972 - Jolida CD player TO BUY 5751 RCA Thanks to everyone's great detective work and comments on this peculiar "RCA 12AX7A". The reasons I say this, is because (a) there were amplifier designs almost dating back to the 6L6's introduction in 1936, that put over 400V on them (b) RCA sold "6L6-GC" tubes that appeared not to Both of these will be darker/thicker than either the rca 5751 or the teles. 12AX7A for the first tube, or if you want your 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. Also, as tube manufacturing became refined, the 12AX7A became much quieter. I can't really offer much help on the new production tubes, but I do know my way around NOS tubes pretty good. Another interesting tube with a similar looking plate to the shorplate RCA 12ax7a is the shortplate Raytheon 12ax7a, sometimes seen in Organ labeling (Baldwin), have seen them with made in US labeling as well as the more common "Registered" label, made in Japan. These remove harshness in some guitar amps. This is why vintage Fender tube chart calls for 7025. All of the Ruby preamp and rectifier tubes are tested and selected for low microphonics and hum This insures that even the highest gain tubes will be quiet and dependable. (posted on January 14th, 2015) Be the first to review “RCA 12AX7A ECC83 Vintage Tubes Perfect #1644005/36” Cancel reply. 12AX7 RCA NOS long gray plates $40 - OUT OF STOCK 12AX7 RCA used/ tested long grey plates $30. Mica, Double. pdf (630827 bytes) 12AX7A RCA (RC30) tt 6201. The amp is a SF Princeton NR and I am getting some RCA NOS tubes. RCA 12AX7 RCA NOS LONG BLACK PLATE 12AX7 OUT OF STOCK 12AX7/A RCA NOS 1960s production grey plates $60 OUT OF STOCK ANOS 12AX7A RCA USED TESTED $25 . Some have alternate markings such as Amperex, GE, Motorola, Silvertone, etc. Radio tubes are 12AX7A: RCA Receiving Tube Manual Brand on Tube, Kentron. 12AX7 RCA Long Black Plate ANOS $40. pdf (902849 bytes) 12AX7S Philips rca 7025-12ax7a-ecc83, 7025 12ax7a ecc83 Is Similar To: Electron Set 1-6 1947 Handbook Data Vol Tube Laboratory Hb-3tube Vacuum Rca (18% similar) Up for bid are set of 1959 Rca hb 3 tube handbook laboratory vacuum electron tube data set also 1959 Rca semiconductor products handbook hb 10 vol 1 please check my other auctions. Very reliable, good tone, and reasonable price. The nuvistor was developed by RCA and it was first introduced in 1959. Anyone have any suggestions for a source for a "quality" replacement ? I think this one is on it's last leg as it's 15+ years old. ᅠᅠ Hi Mike, just wanted to let you know that the two JAN 5751 tubes arrived and sound outstanding in my Soldano SLO. Audio Classic's buys and sells the finest in home audio/video equipment The 12AX7A was the revised version for controlled heater warmup. If you are looking for the best tone for your gear, then the RCA 12AX7 is the  Considered to be the best 12AX7 ever made in the US - these are the famous RCA 7025 that used to be in all of the great amps. Continental U. 7025 RCA. As above but USED TESTED GOOD For Gain, Transconductance, Noise and Microphonics $5 discount for obscured, missing or logo other than RCA: Out of Stock: 12AX7A/ECC83: RCA 12AX7 1960's & 70's Gray Plate NEW (NOS) As used in many Fender, Peavey, etc. The RCA from the 50s and 60s can be good as well. You searched for: rca 12ax7a! Etsy is the home to thousands of handmade, vintage, and one-of-a-kind products and gifts related to your search. 03. * The 12AX7A is the perfect fit for the Fender 5F6A, it is the original tube specified for the 5F6A. It was designed for use in high fidelity audio circuits. 99. 12ax7a Rca Sleeve Of (5) Tubes Nos Nib 12ax7 Top Quality (1967) Read Details. See our Best 12AX7 Review for more information. pdf (176880 bytes) 12AX7A General Electric tt 12AX7A. So much in fact that a lot of 12AX7A's were labeled 7025's (a very quiet version of the 12AX7). 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. 12ax7a Rca Sleeve Of 5 Tubes Nos Nib 12ax7 Top Quality 1967 For Sale Online. Buyer: mike7it9 ( 488) During past month NOS RCA 12AX7A 7025 ECC83 12AX7 USA TUBE "CREAM OF THE CROP" HIGHEST EMISSIONS! "6L6" stamped in the metal. The red print on the glass has the RCA logo (partial / missing). Your Review. NOS/NIB Preamp Tubes. Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. When it comes to new tubes, I do hear significant differences . 1 in stock. I made this mostly so I could have a second ear in hearing the differences. 12AX7 tube is the most common preamp tube today. A new Chinese 12AX7A tube. So the bottom line is that you can use either of these tubes in your Marshall amp. RCA 12AX7A 12AX7 Vacuum Tube Made In USA Tested Gray Plates Red Label See more like this RCA 12AX7A / ECC83 NOS Vintage Vacuum Tube / Audio Tube 5. Date on tubes:61-17 manufactured in 1961 on the 17 week for WURLITZER ORGAN Co. A. I like an Amperex 12ax7 in V1 and an RCA 7025 or 12ax7a in V2 of my blackface Fender amps. Browse your favorite brands ✅ affordable prices ✅ free  NOS RCA 12AX7A ***SPRING SALE!***. pdf (902849 bytes). Plug the right tube in V4, in this case it happens to be one of the only RCA 12AX7 that sounds right to me, and the amp turns into Get the guaranteed best price on Preamp Tubes like the Groove Tubes Gold Series GT-12AX7-C Preamp Tube at Musician's Friend. Number: Follow us on 12AX7A or is it This came out of my AKG Solid Tube Mic. NOS/NIB Power Tubes. Get a low price and free shipping on thousands of items. If you're thinking about spending $48 for new current production russian tubes with gold plated  The 12AX7A is the perfect fit for the Fender 5F6A, it is the original tube specified for the 5F6A. All good! Buyer: funky-drummer ( 225) Jan 28, 2015 NOS RCA 12AX7A 7025 ECC83 12AX7 USA TUBE "CREAM OF THE CROP" HIGHEST EMISSIONS! (#231335324005) FeedbackFromWhenEverything as promised and quick ship. 50 Buy Now; ECC83/ 12AX7A-TUNG SOL RU Tung-Sol Russia The Russian Tung-sol ECC83/12AX7 is a remake of the classic early American designed 12AX7 from the early 1960s. Read honest and unbiased product reviews from our users. NOS 12AX7A RCA US made. always state exact brand of tube and type of packing. 7025, ECC803S, 12AX7A Tube RIAA Phono Preamplifier Schematic. Should I just go to local music store and get Groove Tubes 12AX7 Gold series? NOS Audio Tubes These tubes are also listed with our regular New Old Stock tubes, but making the separate category gives you the chance to browse these specifically. Browse your favorite brands ✅ affordable prices ✅ free  Often RCA and GE made these for electronic organ manufacturers, and have the Sometimes, 12AX7A tubes made for the US Military are labeled 12AX7WA,  Results 1 - 48 of 589 Get the best deal for Rca 12ax7 from the largest online selection at eBay. On my . NOS RCA 12AX7A 7025 ECC83 12AX7 USA TUBE CREAM OF THE CROP HIGHEST EMISSIONS! OVER 200 SOLD. These people mean the brand name of the vacuum tube. Here is a 12AX7 tube. Here are some pictures of my RCA 12AX7A with their box. It was released for public sale under the 12AX7 identifier on September 15, 1947. $105 A Comparison of Current Production 12AX7 Tubes. It's just that an NOS 12AX7A tube is considered to be premium over the 12AX7. Some have different labeling than the one pictured. What is 7025? In the old days when not all 12AX7 were equal, low noise 12AX7 was given a different type code - 7025. 12AX7A 5U4G 5U4GB 5Y3GT 6AN8A 6GW8 6SC7 6SC7GT 6L6GC 7025 7199 7355 7581A 8278 ECC83 ECC801S ECL86 EL34 EL503 EL509 EL519 EL84/6BQ5 Description. 99 Add to > Vacuum/Electron Tube > WESTINGHOUSE 12AX7A ECC83 O 14mm We call you back. 12AX7 Black Plate Review, USA tubes as good as Mullard & Telefunken "The earlier a signal is in the audio chain, the more important it's amplification is. They are very quiet and their sound is smooth warm and have a silky but very detailed high end that I like as they get drums and strings sound great. 3mm Output . For a real treat, if you can find them in good shape, rca BLACKPLATE 12ax7's (NOT "a"s) have a wonderful tone for audio- very luscious, but responsive. In the original 1960's RCA tube boxes. Shop with confidence. Here's a short demo, between the two tubes. Test 100% of nominal or higher. As far as I can determine, Raytheon sold off a lot of plant to GE and outsourced much of their tube supplies from 62 onwards to Raytheon factories outside US, and other US suppliers. This was due to the use of tubes with their heaters wired in series, typical of lower priced TV sets and "5 tube" radios. 12AD7: Non-microphonic/low hum version of the 12AX7 made by Sylvania and NEC in Japan. 40 product ratings. Two 12AX7A RCA U. The 12AT7 also has a gain factor of 70, but since the plate resistance is different, the 5751 is closer to the 12AX7. 12AX7 Tubes. I am getting some new tubes for my amp. 7025 RCA   Buy BUGERA Amplifier Tube, White (12AX7A): Tubes - Amazon. However the RCA long black plate 12ax7a tubes are the cream of the crop for overdrive tones and priced like it but the GREY plate tubes are great also and have a bit more singing highs which I like ! While I am not expecting any challengers to my friend's RCA Command Series that he so graciously lent to me a few weeks ago to get a taste of NOS tube rolling, I have only had a chance to listen to one tube and was wondering if any of these might be "diamonds in the rough". Great for audio applications that uses a 12AX7. guitar amps as well as other USA audio amps. Page 2 of 4 < Prev 1 2 3 NOS QUAD OF VINTAGE RCA 12AX7 12AX7A TUBES | eBay 5751 RCA Black Plates 1960's - 1970's (double mica) (RCA are very sweet sounding and a high quality 5751; low noise and good bass) - McIntosh C500T Tube Preamplifier - Aesthetix - VTL 7. pdf (374410 bytes) 12AX7A, RCA (RC30), tt, 6201. The RCA has a huge amount of power and really makes the amp sound great. Tip Shape, Pinched Tip. One current production 12AX7 tube that I have found competitive with GE is the 12AX7 LPS from Sovtek. 1981 Tokai LS80 Love Rock Guitar. 12ax7a: Can be used in series or parallel circuits. Low noise. 12AX7 RCA NOS long gray plates $40 - OUT OF STOCK 12AX7 RCA used/tested long grey plates $30 This RCA 12AX7A tube has gray plates and a halo getter. Look for the ones with the DULL black plates. I know some are labeled with different brand names, but that doesn't matter. I have a small amp repair business, and sell a lot of these, with almost no returns or failures. Glass Color, Clear Glass. This two-stage audio preamplifier is intended for use with high-fidelity magnetic phonograph pickups. Choose from tubes that test as good or bargain. Both tested very well, have Red graphics, one good one poor, both with thfrom Toggle navigation RCA Vintage Lot #4 12AX7A (QTY 1) w/Free Shipping $50 + Free Shipping Add to Cart. quad RCA 12Ax7A 7025 ECC83 1964 balanced in original boxes the OLDEST grey ribbed 14mm plates ANOS RCA 12ax7/ECC83/7025. ( model : 12AX7A ), ( Brand: Rca ) Review (mpn: 12ax7a for sale) 12AX7A Pair Rca 6681 Vacuum Tubes Tested Good. All test strong. Highly recommend! NOS RCA 12ax7: I can't stress this highly enough. The 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. $105 Number one choice for guitar amps where lower gain and smoother tone is required. I tried the Tung-Sol reissue I got from Doug's and there's just no comparison. i collection(and my ears) cr Visit this seller's eBay Store! TUBEMUSEUM NEW YORK FeedbackFromWhenAs described super fast shipping thanks! This RCA 12AX7A tube has gray plates and a halo getter. Find helpful customer reviews and review ratings for RCA 12AX7 A at Amazon. Showcasing 12ax7a 7025 nos available to buy right now. The overall gain of the circuit is about 150. I would even prefer to spend my money on GE, Ei, Raytheons, or CBS tubes. We have a small stash of these   Results 1 - 48 of 121 Get the best deal for Rca 12ax7 Nos from the largest online selection at eBay. £94. All are from the early 1960's (letter dates codes may vary slightly). The one, the only. rca 12ax7a ecc83 vacuum tube curve tracer match pair nos nib sweet smooth tone. Best 12ax7 tubes Discussion in 'Amps and Cabs [BG]' started by Liam Wald, May 21, 2011. Thanks! I have a pair of RCA 12AX7A tubes that I like how they sound. After reading members' ideas on possibly a "mismarked tube" , "an osc/mixer for TV tuner" and "Built more like a 6X8", I was brave enough to test this tube on my Stark 9-66AU using the 6X8 settings. pdf (374410 bytes) 12AX7A Tung-Sol tt 12AX7A. Comparisons Basically, the standard 12AX7 spec that applies to 12AX7 / ECC83 / 7025 tubes, has a reference of 1. Real Tube Manufacturer, RCA. Tube Data Sheet Locator. Compared to the 5751s they replaced, they clean up a lot better with my The 12AX7 was made for quite a while. Both can be a bit expensive these days. No matter what you’re looking for or where you are in the world, our global marketplace of sellers can help you find unique and affordable options. You are bidding on RCA 7025 \ 12AX7A \ ECC83 Vintage Preamp Vacuum Tube 14mm Grey plates, halo getter, September 1964 date code "64-09". preamp vacuum tubes. Grab these popular tubes while supplies last! Click "more info" for current availability. This is according to the RCA receiving tube manual. I've also owned and heard the GEs in the past but thankfully don't have a pair on hand at the moment ;-) Now, regarding nomenclature - the CV numbered tubes are British military tubes labeled according to the British Military numbering system - they are still just 12AX7s. WE MUST BE DOING SOMETHING RIGHT. RCA 12AX7's, 17mm, black plates from the 1950's…$110. Nuvistors. NOS RCA ARE THE BEST SOUNDING 12AX7 TUBES EVER PRODUCED! I'm going to buy up enough of these tubes to keep my AC30 running at least until the Large Hadron Collider sucks us all into eternity, possibly even longer. Tube Amp Doctor NOS tube buying list only offer unused new items. rca 12ax7a ecc83 $108. 12ax7a AMC. Thanks. That RCA 7025 commands a pretty good price these days because it is such a good tube. RCA 7025 VINTAGE Tube 14Mm Grey Plate 12Ax7A 12Ax7 Nos (1964) - $185. After the original 12AX7, additional variants were issued with various industrial numbers (including the 7025) as well the 12AX7A. I have been reading some things online but I am still a little confused. The RCA's are about 25--30% cheaper than the Sylvanias in matched pairs (thanks Joe!) The one 'regular' type 12AX7 I really love (it kick's ass with rock music -- and it's still cheap) is the RCA 17mm long blackplate! Wow! The 12AT7 v. Grab these popular tubes while supplies last! The label conditions vary, but these tubes are all the same construction. The 5751 has the same plate resistance as the 12AX7, but the gain factor is only 70 compared to 100 for the 12AX7. I was wondering if the 12AX7 and 12AX7A are interchangeable? If there any advantage of using one over the other. Are they same? It seems like many people say they aren't. Your Rating They have a very clear unhyped treble though and they can add clarity in all tube systems. NOS 12AX7 Philips US made. 12AX7A RCA greyplate: New Old Stock in original and whiteboxes. E400 Tube Headphone Amplifier Pre Amp Tube 12ax7 6p6 Rca Input Rca 6. 1967 Mullard ECC83/7025 1950's RCA 5751 Black Plates 1950's Sylvania JHS This is the "milspec" version of the 12AX7, but is also slightly different. 12ax7a rca

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