Vacuum Tube - 12AX7LPS, Sovtek

Vacuum Tube - 12AX7LPS, Sovtek

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9 pin miniature preamp tube (Amplification Factor = 100). This Russian tube is full bodied and well balanced. It has a high gain with a very smooth presentation. In overdrive, it is not quite as defined as the 12AX7-S-JJ, but it offers more crunchy fizz. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.

RoHS Compliant
Item ID:
Product Measurements by Type
Amplification Factor94
Capacitance, Cathode to Heater5.0 nF
Capacitance, Grid to Cathode1.6 pF
Capacitance, Grid to Heater1.6 pF
Capacitance, Plate to Cathode0.46 pF
Capacitance, Plate to Heater0.46 pF
Capacitance, Plate to Plate600 pF
Capacitance, grid to plate1.7 pF
Grid Circuit Resistance (Rg), Fixed Bias1 MΩ
Grid Circuit Resistance (Rg), Self Bias2.2 MΩ
Grid Reverse Current0.2 μA
Heater Voltage6.0 - 6.6 V / 12.0 - 13.2 V
Heater to Cathode Voltage200 V
Plate Current (Ia)8 mA
Plate Dissipation (Wa)1.2 W
Plate Resistance (Ra)56 kΩ
Plate Voltage (Ua)330 V
Transconductance (S)1.7 mA/V
Packaging Information
Packaging Dimensions1 in. × 1 in. × 3 in.
Weight (Packaging)0.037 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet595 KB

Questions and Answers

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Asked by Anonymous on March 9th, 2017.
Matt H.
March 9th, 2017
Staff Member
These tubes have a balanced eq and are nice and smooth.

Product Reviews

5.00 out of 5 based on 3 reviews
- January 22nd, 2018
5 out of 5

THE phase inverter tube in my opinion. I stock them. I've used dozens, in new builds, upgrades and repairs. Also can provide a nice warm tone in the V1 spot in a head cab ONLY. Speaker/cabinet/chassis vibrations can harm this long-plate tube, according to some.

- October 17th, 2015
5 out of 5

These are great and reliable tubes for phono sections of stereo preamps. They have very long life way over 6000 hours. The EH short plate version is quieter but not as warm sounding. Those will last a long time too. Highly recommend the Sovtek 12AX7LPS +++++

- July 27th, 2014
5 out of 5

I can't attest to this tube's value in any place but the driver stage, but in that position there is no other tube I would even consider. The best.