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29th March 2007, 02:38 PM
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diyAudio Member
Join Date: Mar 2004
Location: Albury NSW Australia
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A newly aquired Hum
My preamp which has a regulated psu and 12au and at7's has developed quite a hum.. not mains hum but a loud clean hum. I changed the rectifier tonite and it went away completely for 2 hours and then it has reappeared so I assume the rectifier has been cooked..
so the question is. Where would i start? I assume the rectifier must be passing too much current causing it to hum? I would appreciate any suggestions as to where to start. The hum is in both channells... thanks for any suggestions Nick
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