Vacuum Tube - 12AX7WA, Sovtek
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$22.95
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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.
RoHS Compliant
Accessory Items:
| Amplification Factor | 85 -110 | |
| Bulb Temperature | 95°C | |
| Capacitance, Plate to Plate | 0.4 nF | |
| Capacitance, Transfer | 0.55 nF | |
| Capacitance, input | 2.15 nF | |
| Capacitance, output | 1.9 nF | |
| Cathode to Heater Voltage | 100 V | |
| Grid Reverse Current | 0.2 μA | |
| Heater Current | 305 / 153 mA | |
| Heater Voltage | 6.0 - 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 Dimensions | 1.1 in. × 1.1 in. × 3.1 in. | |
| Weight (Packaging) | 0.036 lbs. |
 Specification Sheet | All Models |
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Questions and Answers
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1 answers
What is the heater's voltage?
Asked by Anonymous on March 21st, 2019.
March 21st, 2019
Staff Member
6.3V or 12.6V according to the data sheet above.
1 answers
Hey! Thanks in advance.
My Digitech RPM-1 manual says to only replace its lone tube with a 12AX7A. It is a stereo device, if that makes any difference. Anyway, what is the difference between a a 12AX7, a 12AX7A and a 12AX7WA?! I would like a warm, immediate fuzzy tone to my rotary emulation, but shopping is hard being limited to just 12AX7A's... Know the difference? Any recommendations knowing i prefer warm and fuzzy vs the current sharp and thin tone I am getting? Again, thank you in advance....
Asked by Anonymous on June 21st, 2020.
June 23rd, 2020
Staff Member
The suffixes at the end of different 12AX7 varieties only indicate subtle changes in specs or design. Using any 12AX7 or 12AX7 variant will be safe for your application, however, the sound for each may not be ideal. You can use our 12AX7 tube comparison chart to help you determine which 12AX7 is the best fit for your application. https://www.tubesandmore.com/tech-corner/12ax7-comparison-current-made-tubes
Substitute Products
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Product Reviews
Probably the most rugged current production 12AX7. This tube is my first choice for cathode follower positions in guitar amps. You just can't kill these things.
These tubes are very close to the old GE version. I like switching pre-amp tubes on my tube amps and These work great. Also, I do trust Antique Electronic Sully. Good people.