Sovtek 12AX7WA Standard and Balanced
The Sovtek 12AX7WA is world-renowned for its smooth, round tone. This ultra “low microphonic” tube is used by Fender®, Ampeg, Carvin, and Hartke, among others. It can replace the ECC83.
The Sovtek 12AX7WA has lower gain than the “WC” version. The Sovtek 12AX7WA is designed for amps with DC heaters so should not be used in amps with AC heaters as there is the probability of increased hum in AC heater applications. FOr AC applications we recommend the JJ ECC83MG medium gain valve as it has a spiral wound heater. This lessens hum.
We have three options for you to select :
- Factory Test :Direct from our stock
- Premium tested. We test for
- Shorts
- Cathode to heater insulation . This is important to ensure low hum
- Anode insulation
- Measure the anode currents on the two triodes and label the box.
- Tested at 250 volts with – 2 volts bias to simulate real conditions in your amp.
- Balanced: In addtion to the above tests and labelling, we select the units where the anode currents are closely matched and our box label shows the anode currents and the Gm of each triode. Applications include phase splitter position in your amp. This ensures even drive to the amp output stage
