NOS 12AX7 / ECC83 / CV4004 / 7025 / B759 / M8137 / ECC803S
Please scroll to bottom of page for 12AX7 tube reference information.
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All prices are per tube
BEL 12ax7
$79.99The India made BEL 12AX7 is by far the best value in 12AX7 tubes. Made on Philips Mullard equipment and identical to a mullard 12ax7, but pumped in India, these have the exceptional tone of a Mullard and accentuated mids without the hefty price tag. Branded BEL or other branding. All remaining stock has balanced sections (both triodes measure equally)$79.99 per tube
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All prices are per tube
Brimar CV4004 12AX7
$119.99The Brimar CV4004 is an excellent UK made 12AX7 with a quasi boxed anode. Long plate construction, superb for phono stages, hifi, and guitar amps! We have a limited supply of low noise selected tubes, as well as Brimar CV4004 with balanced sections. $119.99 per tube!
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All prices are per tube
Brimar CV4004 12AX7 Balanced Sections
$129.99Balanced sections for phase inverter and other applications where both sections of the 12AX7 need to be equal. We have a limited supply of low noise Brimar CV4004 balanced section selected tubes. $129.99 per tube!
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All prices are per tube
CBS 7025
$219.99CBS 7025 are incredibly rare, and one of the best sounding long plate 7025/12ax7 variants. These were manufactured in the 1950's and have long grey plates, and 7025 is sandblasted/etched in the glass. Some of the best input tubes for guitar amps available! Enter qty 2 for a matched pair. $219.99 per tube 7025 is a 12ax7 special quality-low noise tube with spiral wound filament for low hum.
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All prices are per tube
EI 12AX7 Pre War Yugo
$79.99NOS 12ax7 CV492 Of all the 12AX7 tubes we have tested here at Tubes Unlimited, these amazing CV492 smooth plate tubes made in pre-war Yugoslovia have tested with some of the highest umos levels we have seen! These were also used as original equipment in the Audio Research SP-6/8. Here is what one of our customers have said about these powerful tubes: " These tubes kick butt! A huge upgrade for the Behringer 1953 microphone pre-amp!" Brian Puglisi If you are an audiofile or musician, you owe it to yourself to pick up a couple of these NOS tubes! Tubes Unlimited has one of the largest known supplies left in the world of these amazing tubes, so we can offer unprecedented matching and noise testing! Recommended by Dr. Z for all of his amps! Original equipment for Audio Research SP-6/8. Just $79.99 per tube (various brandings)! Balanced Triodes Just $89.99 per tube! Pre-war Yugo CV492 NOS NIB-Various brandings, all made in pre-war Yugoslovia) $79.99 per tube
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All prices are per tube
GE 12AX7 1960s-1970’s
$149.991960-1970's GE NOS 12AX7 tested and noise tested $149.99 per tube. Warm, punchy and clear and sound excellent when driven into distortion,,,excellent for guitar amps where low noise and low microphonics are required!
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All prices are per tube
GE 12AX7 JG 1950’s Long Plate
$129.991950's GE JG 12AX7 Long Plate tested and noise tested. $129.99 per tube. These GE 12AX7 long plates are my favorite tube of choice for V1 of most guitar amps. Excellent detail, warm and bluesy, they sound amazing at the front end of your lower gain guitar amps, and in the "clean" channel of channel switching amplifiers.
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All prices are per tube
JAN GE 12AX7WA
$149.99JAN GE NOS 12AX7WA tested and noise tested $149.99 per tube. Warm, punchy and clear and sound excellent!
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All prices are per tube
JAN Philips 12AX7WA
$119.991980's Philips (made on Sylvania equipment) 12AX7WA NOS Long pinched Plate $119.99 per tube. Same ultra durable construction as the Sylvania 12AX7WA. Not recommended for high gain positions.
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All prices are per tube
Japanese 12ax7
$69.99Super high quality japanese (TEN) made 12ax7 (very similar construction to the GE 12ax7). Punchy, low noise, low microphonics! Incredible value and far better than anything being made today! $69.99 each
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All prices are per tube
Mullard 12ax7
$249.99The Mullard short plate 12ax7 if highly regarded as it should be! Vintage Mullard 12AX7 made in the 1960's and 1970's have great accentuated midrange tone and bass, and are an overall excellent 12AX7 choice for Hifi and guitar amps! Just $249.99
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All prices are per tube
Mullard CV4004
$249.99Mullard CV4004 12AX7 Mullard CV4004 12AX7 tubes we have tested here at Tejas Tubes, are of amazing quality and have an exceptional tone. These tubes were manufactured in England by the Mullard company. They are renown for their tone in both guitar amps and hifi stereo. Try some out in your system and expereince the best!!! This is a suitable replacement for any 12AX7 tube type. Various brands available.
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All prices are per tube
Philips 12ax7 Bugle Boy Holland
$349.99The Bugle Boy Holland made Philips Amperex 12AX7 is one of the earliest Holland made 12ax7 tubes! They are incredibly lively with a warm punchy sound, excellent bass, and enhanced great upper midrange! Tested and noise tested! Just $349.99 NOS in original boxes, screened for low noise/low microphonics in our Vacuum Tube Valley tube characterizer.
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All prices are per tube
Philips 12ax7 Holland
$249.99The Holland made Philips / Amperex 12AX7 is an amazing sounding Holland made 12ax7 tube! Warm, punchy with excellent bass, and great upper mids! the dimple getter Holland 12AX7 are Just $249.99 NOS in original boxes, screened for low noise/low microphonics in our Vacuum Tube Vally tube characterizer.
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All prices are per tube
Raytheon 12ax7
$249.99The JRP Raytheon tall black plate 12AX7 is an awesome choice for many guitar amps and hifi systems! Just $249.99. Most were made in the late 50's and 1960's. Highly recommended for the following equipment:
- Bad Cat 'Custom Shop' Cub II R 1 x 12 Combo Tube Amplifier Rogue Cronus Fender Guitar Amps Broskie Aikido PH1 Quicksilver Carver 180 amp
- Cayin A-50T
- THOR phono stage
- Rogue Tempest
- CAT JL-2 amp
- Rogers High Fidelity EHF-100 2011
- Aguilar DB750 bass amp
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All prices are per tube
RCA 12ax7
$179.991960's -1970's RCA short Plate 12ax7 NOS Tube. These are incredible sounding 12ax7 and were original equipment in older Fender guitar amplifiers. One of the best Rock N Roll guitar amp tubes ever made! Screened for low noise and microphonics just $179.99
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All prices are per tube
RCA 12ax7 ANOS
$99.99Lightly used, testing new, these 1960's -1970's RCA short Plate 12ax7 ANOS Tubes are a great value. These are incredible sounding 12ax7 and were original equipment in older Fender guitar amplifiers. One of the best Rock N Roll guitar amp tubes ever made! Screened for low noise and microphonics just $99.99
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All prices are per tube
RCA 12AX7 ECC83- Italy
$79.99This 12AX7 is actually very rare as I have never seen these available elsewhere. These were branded ITT, but made at the RCA plant in Italy (Geloso), they have excellent detail and clarity. If you are looking for NOS 12ax7 at an exceptionally low price, then the RCA Italy 12ax7 is a no-brainer!
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All prices are per tube
RCA 7025
$199.99Tight bottom end along with the sparkle, RCA 7025 are extremely dynamic sounding,,, these are some of the best input tubes for guitar amps available! NOS Short Grey plates in military boxes. $199.99 per tube 7025=12ax7 special quality-low noise
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All prices are per tube
12AX7 Vacuum Tube Reference Information
ECC83: This European nomenclature for 12AX7.
ECC803/ECC803S/E83CC: This "premium" version of European made 12AX7. The "S" on the ECC803S indicates "select" and are usually gold pin. These are usually found on Telefunken and Siemens branded tubes and a very rare Radiotron ecc803S version from the Philips factory in Australia.
12ax7: Original version of the 12ax7. Early production was manufactured in the USA by Tung Sol, RCA, Sylvania, GE etc. The earliest 12ax7 have larger 17mm plates. The 12ax7 version without an "A" suffix is to be used only in parallel filament circuits, so do not use these in a “series” circuit. This is an unusual problem to run into as they are normally found in TV sets. The best way to tell if your circuit is a series circuit is by examining all of the tubes and looking at the voltages (voltages other than 6 and 12 volts). If all tubes in your circuit start with 6 or 12 (except for 5 Volt rectifiers) , then it is a parallel.
12ax7a: Can be used in series or parallel circuits. 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.
12AD7: Non-microphonic/low hum version of the 12AX7 made by Sylvania and NEC in Japan. Great for audio applications that uses a 12AX7.
12DT7, 12DM7, 12DF7: Special quality low noise/low microphonic versions of the 12AX7. Usually branded as Westinghouse or Raytheon.
7025: Hifi low noise version of the 12AX7 with all other specifications being the same as 12AX7. Tubes marked with both 12AX7 and 7025 are usually low noise as well.
5751: Military version/drop in replacement for the 12AX7, but is actually different. The 5751 has identical plate resistance to the 12AX7, but the gain is 70 compared to 100 for the 12AX7. Early production 5751 have extra thick mica spacers (often three know as triple mica) and extra support rods to minimize microphonic response. Many 5751 also have matched triode units.
7729: CBS made industrial version of the 12AX7 with gold pins for special applications requiring reliability and low noise/low microphonics.
6681: The mobile version of a 12AX7. Usually these are the same as a regular 12ax7 which have been tested and screened to perform well in circuits with large variations in filament voltage.
7058: Same as a 12AX7 but with a 13.5 volt non-tapped filament. Can be used in circuits which do not utilize the 6.3V filament tap. Performance is same as regular 12ax7.
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