Quote:
Originally Posted by Radio Tech
Hello everyone,
I have touched the control grid only to obtain a fairly weak hum even at full volume,
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You might well get very little hum from just a UL84. It has very low gain when used like this. I used to rip them out and rebuild the amps using a UCL83 so it had a pre-amp, as a UL84 on its own is so quiet. It isn't hard to do.