Thanks all for the good advice, on- and off-list.
Closer inspection shows a new-looking crack along the edge of the HV bypass
cap at the bottom of the plate choke. Also, that area is very well coated
with accumulated dust. I will kick myself for not cleaning it up at the
outset.
There are no visible marks from arcing to the cabinet.
Next steps: clean it up, replace that cap, temporarily put a 2 amp fuse in
series with the 1 ohm 5W resistor that keeps blowing, and try again.
BTW anyone know what that green crud is that they slather all their solder
joints with and how to get it off? Acetone attacks it slowly but a dental
scraper is so far my best method.
73, Carl WS7L
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