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Repair diagnosis for cdp with humming tranny

I have an older Raysonic CDP which has a humming transformer once the unit has heated up for an hour or so. I pulled the tubes, hooked it up to a a DAC, and it works perfectly (never hums) if you like the sound, :-(

I've had it into a local repair shop twice - they tried but didn't fix. Any techies out there who might have a thought?
newbee

Showing 1 response by erik_squires

erik_squires
15,772 posts
 
Try it in another home. 

If it goes away, you have DC on your line. 

The cure for this is to eliminate the source (often digital power supplies, and dimmers) or to get a balanced power supply. 

Best,

E
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