2. tech-talk
  3. 138342-548

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 mcintech

mcintech
128 posts
 
Newbee,

I would lift the PC boards the transformer is attached to (INPUT and OUTPUT) and check ALL solder joints, but especially under capacitors and rectifiers and under wire connections. Chinese made gear often exhibits poor solder, especially in higher current areas like power supplies and power amp outputs.
More to discover