[Amps] Alpha 76 question

Manfred Mornhinweg manfred at ludens.cl
Mon Nov 23 19:41:41 EST 2015


 > My Alpha 76 periodically "snaps" loudly (arcs?) when idling...maybe
 > every 20-30 minutes.  Any ideas what this may be?

I don't know anything specific about that Alpha, but I have seen this kind of 
arcing at regular intervals when there is a simple power supply that has no 
bleeder and no load on it. There are very often lots of very narrow but tall 
spikes riding on the power line. When there is no load at all on a power supply, 
these will slowly charge the filter capacitor to such an overvoltage that 
something arcs.

So I would suggest to check all bleeder resistors, first of all.


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