[Amps] SB-1000 problem

Brad Hedges bhedges at nc.rr.com
Fri May 7 09:28:25 EDT 2004


I've got a Heathkit SB-1000 KW amp; uses a single 3-500z. It's got an
original Eimac. The unit hasn't been used in about six years. I brought the
caps up on a variac fine. With the tube removed (running on 240) the unit
fires up fine - the high voltage meter showing about 3350 volts.

The problem comes when attemting to start it up WITH the tube. It blows the
fuses (10a in each side of the line) every time.

Two things come to my nearly virgin (to amps and troubleshooting) mind - a
short in the tube, which I think is unlikely; or the tube just needing
"burned in"; hooking up the filament to ionize (??) it properly (this last a
suggestion from a local ham).

Any ideas about where to begin looking? I have the manuals and can trace a
circuit, but really have no idea where to begin.

Thanks,
Brad
K0BHC



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