Xray PSU block failure
Posted: Wed Aug 18, 2010 10:05 pm
While testing our home made PSU block I slipped with the scope probe on the control electronics sending full audio power ie clipping severly to the multiplier stack transformer. The DMMs monitoring showed just over 240kV when there was an awful thump from the tank and the positive supply fell to 125 volts while the neg supply was at the correct 65kV. and now the audio amp is frying itself so out of the oil it came.
Closer inspection showed all caps and diodes OK but a very small dark spec on a part of the positive supply transformer secondary
The winding should be around 40H but it shows a few mH --a shorted turn or two
so now I have to rewind this secondary
Closer inspection showed all caps and diodes OK but a very small dark spec on a part of the positive supply transformer secondary
The winding should be around 40H but it shows a few mH --a shorted turn or two
so now I have to rewind this secondary