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Growing up quick...with a 38-690xx Pics added.
jerryhawthorne
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#39

05-22-2013, 05:17 PM
Hum not increased with the volume is typically in audio circuit after the volume control. Try pulling one tube at a time and see when it disappears. This will give you an idea as to where to look. If 60 cycle, probably filament associated (filament to cathode leakage). If 120 cycle probably B+ related.
Good luck, nice job so far!
Jerry
A friend in need is a pest!  Bill Slee ca 1970.
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RE: Growing up quick...with a 38-690xx Pics added. - by jerryhawthorne - 05-22-2013, 05:17 PM



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