Dear Sir,
One phenomenon that may be occurring is the in-rush current
to the amplifier is very heavy. This is exacerbated by low line
voltage.
Using a delay timer and DPDT relay with some resistance
switching in and out of the transformer primary for just a
few seconds will allow the HV capacitors to charge slowly,
reducing the amperage drawn by the filter, and would also
allow the tube filaments to also draw current slowly by
limiting the amperage in the primary winding.
Mr. Rich Measures, AG6K, on his website,
SOMIS.ORG, lists a very reliable and affordable
scheme for step-starting that would prevent further
mishaps.
Sincerely,
Hal Mandel
W4HBM
> One last item. I did blow a fuse the other day when I switched the
> AMP on. I replaced that fuse and all is fine might not be related
> but a friend said he thought the fuse blowing could also be the
> cause or related to low voltage as at the time of switching on the
> transformer in the AMP draws more current since the voltage might go
> low.
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