Dear Jeff,
Pull the tubes and start the amp. Make sure the HV leads are
isolated!
Start only the filament department without the HV going.
Vice versa, start the HV without the filament going.'
It might be a rectifier or a filter capacitor or both, also.
The best path to diagnosis is to isolate one section at a time.
Hal
W4HBM
:
> I just put my SB-200 on 220 volts, used it on an 80 meter net one
> night just
> fine. Two nights later, while tuning up it popped the fuses on my
> home 220
> volt sub-box. Pulled the tubes (they seem to look ok) and the amp
> still
> blows the fuses each time I turn it on. No loud bang, pop or any
> noises
> when it died and they only thing inside that looks funky is c12
> (.02) on the
> tube side of the filament choke. C12 had a black spot on the
> outside.
> Would it be a good place to start by isolating the filament tap (6
> volt) to
> see if it still blows the fuses?
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