A few weeks ago I bought a very good condition Hallicrafters HT-41 amp at a
local hamfest for a hundred dollars. The amp is now the heaviest piece of
gear I own; just shy of a hundred pounds. I struggled carrying that thing
the few blocks from the hamfest to parking lot. The HV transformer looks
like an old-style TV power transformer, but super-sized. Surprisingly, it's
120vac only. The amp is clean inside above and below the chassis and there's
no evidence of anyone monkeying around with the wiring.
The first thing I'd like to do is replace the 40 year old HV power supply
caps with fresh ones. The existing supply has six 100mfd 450vdc caps wired
in series for a total of about 17mfd capacitance. The power supply is a
choke-input design. In my junkbox I've got plenty of new 120mfd 450vdc
capacitors. They're about a fifth of the volume as the original ones. This
will give me 20 mfd total capacitance. With this choke-input supply, is
there much benefit (and it has to outweigh the time and cost of ordering
larger capacitors that I don't have) to installing larger capacitors?
Thanks,
Tom N7TM
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