9 pin miniature preamp tube (Amplification Factor = 100). The Chinese 12AX7B is very similar in tone to its standard Chinese cousin, but the Bs seem to average in at slightly lower gain and noise. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.

Russian made reissue of the original Tungsol.

9 pin miniature preamp tube (Amplification Factor =100). This is the ubiquitous Chinese 12AX7 with premium selection. The gain is high and the German Tube Amp Doctor must be filtering out the noisiest ones. Premium selected by Tube Amp Doctor, this is a quiet Chinese 12AX7 with high gain that will bring a dull sounding amp back to life. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.

The JJ 12AU7 is built in the same fashion as the legendary 12AX7 JJ. Solid construction and extreme attention to detail make this tube one of the best preamp tubes in production today.

9 pin miniature preamp tube (Amplification Factor = 100). This Slovakian tube is full bodied and bright with lots of depth and color. It's like the 12AX7-S-JJ on steroids, keeping the definition and adding a lot of bite and brightness. In overdrive, it keeps its well defined bite and brings out the highs. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.

Electro-Harmonix 12AY7/6072

9 pin miniature preamp tube (Amplification Factor =100). This ubiquitous Chinese tube is straightforward and bright. Its high gain gives it some bite, too. In overdrive, it brings out the highs and offers easy access to harmonic sustain. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.

9 pin miniature preamp tube (Amplification Factor = 100). This is the ubiquitous Chinese 12AX7 with added selection. The gain is high and the American "Ruby Tubes" must be filtering out the noisiest ones. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.

JJ Electronics 12AU7, long plate.

The JJ ECC803 is a long-plate version of the standard 12AX7. The longer plates give the tube higher gain. It has a rich and full tone with creamy distortion that does well in any 12AX7 application. Gold Pins for the highest quality possible. Spiral filament for reduced microphonics. JJ Tubes are known for known for their high quality, durability, and their excellence in tone. Formerly produced by Tesla, JJ tubes are still made to exacting standards. They work well in all applications.

JJ Electronics ECC99 RF dual triode

Mullard Reissue 12AX7 Russian made Mullard Reissue 12AX7 dual triode.

Replacement for 6922, 6DJ8, ECC88 and E88CC tubes. Gold pins for the highest quality possible JJ Tubes are known for known for their high quality, durability, and their excellence in tone. Formerly produced by Tesla, JJ tubes are still made to exacting standards. They work well in all applications.

JJ Electronics ECC802/12AU7 dual triode, long plate with gold pins.

This tube is closest in specification to a 12AX7 and can be exchanged with a slight drop in gain. Most companies changed over to the 12AX7 as it became more common. This tube can be tried in later Marshall amplifiers in the first gain position, where the owner of these amps would like to drop the background noise and lower the gain level to plexi or early 70s vintage gain levels with its returned wider frequency response.

9 pin miniature preamp tube (Amplification Factor = 17)

9 pin miniature preamp tube (Amplification Factor = 60)

JJ Electronics 6386 dual triode with spiral filament and gold pins.

High frequency twin triode preamplifier tube used in studio and hi-fi equipment.

JJ Electronics 12DW7 dual triode, with gold pins.

Peavey 'Super 7' 12AX7

Sovtek 6SN7GT dual triode, medium MU.

Replacement 6EU7 Tube Made in Russia

12AT7WC - Triode, Dual, HF

6922/E88CC - Triode, Dual

6414 - Triode, Dual

6681/12AX7A - Triode, Dual

5670/2C51W - Triode, Dual

6111 - Triode, Dual

6072-A - Triode, Dual

12DW7/7247 - Dual Triode, GE

12SL7GT - Triode, Dual, HI-MU

12SQ7 - Diode, Dual - Triode

12SQ7GT - Diode, Dual - Triode

12AV7 - Triode, Dual

12BZ7 - Triode, Dual, HI-MU

12FQ8 - Triode, Dual

12DT8 - Triode, Dual

12AZ7A - Triode, Dual

12AY7 - Triode, Dual, RCA Brand

12AX7A - Triode, Dual, RCA

12AX7/ECC83 - Triode - Dual, Mullard

6201/12AT7WA - Triode, Dual, HI-MU

JJ Electronics premium EF86/6267, with gold pins.

7025 - 9 pin miniature preamp tube Made in China Lower hum/noise version of a 12AX7/ECC83

7581- Tungsol Reissue - Made in Russia

The TAD 7025 WA delivers full gain with smooth top end. No microphonic issues even with the most sensitive preamps. The 7025 WA supports a fat midrange and creates a bold tone with lots of overtones. Played clean the TAD 7025 WA delivers a warm liquid tone which is very responsive to dynamic playing. Overdriven the 7025 WA provides lots of sustain with well defined mid-range punch. - recommended choice for most demanding guitar amp input/V1 stages - extremely low microphonic selected for most sensitive applications - smooth top end - full gain - fat mid range - tight low end

This tube has a well balanced, colorful tone with strongly defined lows, mids and smooth highs. It allows for more clean head-room than higher gain 12AX7s. In overdrive, it is smooth and strong with well defined lows and mids. When pushed into overdrive it offers clean distortion with well balanced lows and mids. The JJ 12AX7 is well suited for all types of music and playing styles. It is also highly recommended for studio pre-amps and hi-fi gear

Premium selected Tube Amp Doctor 12AT7/ECC81-C.

5751 - JJ Preamp tube, Triode, Dual, HI-MU