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Old 11th August 2011, 10:38 PM   #1
diyAudio Member
Join Date: Mar 2011
Default Home build 6L6 pp amp no sound

I gone over and over my power amp I built and cannot get any sound. It is a bassman aa864 but cathode biased. Everything else is exact. I don't have a preamp yet, it's just the phase inverter and output tubes.

Is that okay? Do I need to have the preamp plugged in? It is just a signal line, no voltages. All the voltages read within ranges. I have 420v on the plates, 418 on the screens, 270v, roughly, on the phase inverter plates, 12AX7.

I cannot hear anything from the speaker. Please help.....
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Old 12th August 2011, 11:20 PM   #2
diyAudio Member
Join Date: Mar 2011
Default sound

I found the problem, the rotary switch is weird... and it does work w/o a preamp.
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