Vacuum Tube - 12AX7WA, Sovtek

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Vacuum Tube - 12AX7WA, Sovtek

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9 pin miniature preamp tube (Amplification Factor = 100). This Russian tube has strong lows and bright highs. Its lows demand attention when playing full bar chords. In overdrive, it offers a lot of crunchy fizz. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.

Item ID:
RoHS Compliant
Product Measurements by Type
Amplification Factor85 -110
Bulb Temperature95°C
Capacitance, Plate to Plate0.4 nF
Capacitance, Transfer0.55 nF
Capacitance, input2.15 nF
Capacitance, output1.9 nF
Cathode to Heater Voltage100 V
Grid Reverse Current0.2 μA
Heater Current305 / 153 mA
Heater Voltage6.0 - 6.6 V / 12.0 - 13.2 V
Plate Current (Ia)10 mA
Plate Dissipation, per triode (Wa)1.0 W
Plate Voltage (Ua)300 V
Transconductance (S)1.4 mA/V - 2.65 mA/V
Packaging Information
Packaging Dimensions1.1 in. × 1.1 in. × 3.1 in.
Weight (Packaging)0.036 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet532.23 KB

Questions and Answers

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Asked by Anonymous on March 19th, 2019.
March 21st, 2019
Staff Member
6.3V or 12.6V according to the data sheet above.

Product Reviews

5.00 out of 5 based on 2 reviews
glencindy - February 25th, 2012
5 out of 5

Nice tube very responsive and lively really wakes up your amp. - August 9th, 2010
5 out of 5

Just installed one of these in my Marshall VS 65 watt combo amp. A longtime friend and fellow guitar player (both of us have been playing for over, well let's say 30 years :) ) and I first played a variety of my guitars through the Marshall with its original (and admittedly aged) tube, using a variety of solid and semi-hollow body guitars, some with humbucker pickups and some with single coils. Then we replaced the tube with this Sovtek 12AX7 and repeated with the same guitars. The Sovtek just overall sounded better on both clean and overdriven channels with all of the guitars tested. It doesn't make the Marshall a different amp, just a better sounding version of itself (and it wasn't bad to start with!). Well worth the money and modest effort to make this change!