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Old 7th August 2012, 11:28 AM   #11
SBD is offline SBD
diyAudio Member
Join Date: Jul 2012
First, I'll try and disconnect the connection between the heater supply ground and the High voltage supply ground (currently tied together) - Maybe ground loops.
Mains voltage earth is currently tied to both heater supply and HV supply .

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Old 8th August 2012, 07:07 AM   #12
diyAudio Member
Join Date: May 2010
Location: Hawkes Bay
I don't see any smoothing in your heater supply. You appear to have a very large reservoir cap but no subsequent smoothing filter. As it stands I reckon you will get a sawtooth waveform (4 volts peak to peak riding on the DC component) which will be noisier than 6.3 volts AC. Hope I'm wrong.

Last edited by djgibson51; 8th August 2012 at 07:09 AM. Reason: Clarity
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