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Sony TA-F3A amp hum in left channel

C

chilllr

New Member
First post to these forums.
Recently got a nice Sony TA-F3A integrated amp that sound great, but has one problem. On powering up, there is a hum in the left channel, independent of volume, that slowly goes away over a couple of minutes. No source connected and right channel is clear. I'm not an electronics expert but have repaced a couple of caps in other units before. Any help in how to trace down the problem is appreciated! Cheers
 
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Greetings; welcome to A.k. !
(don't like seeing a new post go a day without response so note I'm no expert on this unit.) Hopefully others will chime in.

Did a little digging on this and might shed some light on the 'hum'.
http://www.audiokarma.org/forums/index.php?threads/sony-ta-f3a-amp-cool-or-what.499887/

Seems like some diode(s) may be culprit. as hum seems to go away sort of indicates that some circuit is powering till becomes stable. i.e. a weak component(s) in the bias circuit.

bink
 
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