OK usually its too much main B+ ( typ 130vdc ). Usually its a shorted
regulator IC or a little diode off it. Hang a meter on that voltage
& turn up the AC. It should go up to a point & stop at the proper voltage.
HVSD goes by many names. Yours is a simpler design. Reason for unplugging
DGS is on a cold start the set will draw a lot of current for a second
& confuse your amp readings. Keeping the draw under an amp protects
the set if there is an overload in the HV. A normal set will draw apx
.5 to 1 A depending on size.
enuf fer now
73 Zeno
LFOD !