random static sound through speaker

[Ranman67]

i there

I Have purchased a retro 1974 hitachi receiver and tied it with a technics d202 turntable. I am using polk audio book shelfspeakers. I have random static from my left speaker (usually at low volume), could be just the radio on or when using the turntable, switched from turntable to radio make no difference. I have had the receiver looked at by pro….says it worked perfectly, he tested it for three days…no static. So basically I start playing a record, after about half an hour it might start up, all I here is the static…no music when the static is there, if I turn up the volume it disappears . I would really appreciate some thoughts, maybe shielding the speaker wire? The receiver plug has no ground, the turntable has a ground wire attached to the receiver. Help please?!

Reply

 

[americanaudiophile]

Sounds like a problem in the receiver. Maybe a bad relay, transistor or switching problem. Take it back to your pro. Tell him that it comes after the unit warms up and goes away when you increase the volume.
A grounding or shielding problem would be immediate and not come and go with time or a volume change.