rocknroller
Active Member
have this audible hum when nothing connected, irrespective of input selection. When music is playing it's masked but definitely present when not. Both channels. With an audio tester, I confirmed this same hum on pins 16/18 of the power supply board. All DC output voltages from board match schematic, though the AC one is a little higher (8.xvac) Some of the larger caps related to the right hand circuit had more metal top showing then i would expect, though they tested fine on a in circuit esr meter. I replaced them all anyway (everything 100uf and higher on right side of diagram, see below) no improvement. This includes the 330ufs that people hadve changed that fixed hum - but not for me.
Should something else in that circuit be looked at/measured, or are the large 15000uf filter capacitors suspect? Hate to change them unless absolutely sure, given the cost.
Should something else in that circuit be looked at/measured, or are the large 15000uf filter capacitors suspect? Hate to change them unless absolutely sure, given the cost.
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