I appreciate all the replies, ladies and gentlemen. This receiver has been
re-capped, fully and the B+ draw was nominal. But as many remarked, primary
power could be playing a big part. I therefore installed a 20A variac in
the power distribution setup for all the B/A's and set it for 110v. No more
heat problems. Thanks to all!!

k3hvg wrote:

I've got a particularly nice NC-183 in the collection. Although nothing
untoward has happened after a number of continuous hours of operation, I
do notice that the power xformer get noticeably hot.. as in it can't be
touched but for a few seconds. Voltage drop considerations aside (they
can be addressed, after the fact), would using a solid-state rectifier,
in place of the 5U4, provide a noteworthy temp decrease? 15 watts is 15
watts, of course, but I'm curious if anyone's actually made note?
Thanks de K3HVG