hw-101 cw (part 2)

[n7kbj]

Part 2:  with the help of several who replied to my first post, I found
several
resistors that had gone out of spec - replaced them and some electrolytic
caps
(on general principles) and good news - the rig now works much better on cw
than it did - when it works.  It appears to be a 'thermal' problem as cw
works
fine when the rig is first turned on - after 1/2 hour warm-up, kapoot.
Tracing
the tone thru V15 (the tone osc and amp) I find I'm losing it right at the
input
(pin 9) - either no tone or it slooowly builds over about 5 seconds.
So - my next question:  I'm begining to suspect the 'PEC' that forms part of
the
osc as everything else in the osc circuit either checks out or has been
replaced.
Can one 'breadboard' together a substitute for the pec and have it work ok??
or is there a replacement source for the pec?

Jim - n7kbj at oneimage.com

Sponsored by the City of Tempe 

Listserver Submissions:  heath at listserv.tempe.gov
Listserver Subscription: listserv at listserv.tempe.gov - "subscribe heath 'name' 'call'"
Listserver Unsubscribe: listserv at listserv.tempe.gov - -"signoff heath"