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Title: how to set bias on Prinzetone - Noob question Post by: amphacker on May 17, 2018, 11:22:30 AM Hi,
I purchased a Prinzetone fully assembled by Ceriatone so I haven't built it myself or ventured inside the chassis. I have a bias probe from Hoffman Amps that allows me to measure the current flowing through the power tubes on pin 8 (cathode). The tubes are JJ 6V6S which I believe are 14W. The 'VoltageChart' Excel document on the Ceriatone website says that pin 3 (plate) on the Prinztone power tubes is 391V. Now, from what I can see, the calculation goes something like this: (Wattage / Plate Voltage) x 0.7 = desirable current, therefore 14 / 391 x 0.7 = 25mA Can anyone confirm if I'm working this out correctly, or advise if not. Many thanks. |