I'm testing my power tubes now (I bought my amp used)...they are 2 Groove tubes
Tube 1:
cathode current -> 39.5 mA Plate Voltage -> 423 V
Tube 2:
cathode current -> 31.4 mA Plate Voltage -> 419 V
Holy shit.....they have to be biased!!!
Here some photos of my bias equipment:
Tube 1:
cathode current -> 39.5 mA Plate Voltage -> 423 V
Tube 2:
cathode current -> 31.4 mA Plate Voltage -> 419 V
Holy shit.....they have to be biased!!!
Here some photos of my bias equipment:
