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Hi folks-
I'm working on a mid 50's rickenbacker tube amp, 2 6l6s, 5u4 rectifier. It wasn't powering up at all when I got it. I have it up and running, but i'm trying to track down a low-volume problem.
The amp sounds good, it's just about half as loud as it should be. Also stays clean nearly all the way up...makes me wonder if there is a gain-loss issue somewhere. All tubes are good.
It's grid leak biased in the front end, then goes to a bass-treble stack, then into a concertina type inverter using a 12au7. All the voltages seem to be checking out in the neighborhood of where they need to be.
Any suggestions on what to check next?
I'm working on a mid 50's rickenbacker tube amp, 2 6l6s, 5u4 rectifier. It wasn't powering up at all when I got it. I have it up and running, but i'm trying to track down a low-volume problem.
The amp sounds good, it's just about half as loud as it should be. Also stays clean nearly all the way up...makes me wonder if there is a gain-loss issue somewhere. All tubes are good.
It's grid leak biased in the front end, then goes to a bass-treble stack, then into a concertina type inverter using a 12au7. All the voltages seem to be checking out in the neighborhood of where they need to be.
Any suggestions on what to check next?
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