>
> After removing the outer cover, I see where the 1mH choke on pin 4 of
> the inside tube (socket N) smoked.
>
> #1 Where can I get a replacement?
> #2 What caused the failure (or where do I start looking)?
If the 221 is similar to the 220 there is no dc voltage applied to the grids,
so I would look for an internally shorted tube. The tubes are dc-isolated from
each other, so the tube in that socket is the culprit.
I'd look at hamfests for a replacement but you can probably get one via Mouser
et al.
73,
Jim, KR1S
http://kr1s.kearman.com/
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