wrote in message
...
On Feb 2, 11:43�pm, wrote:
� � �hi guys,
� � �i am restoring an hq180a. �been a while since
i messed with tubes,
(abt 20 yrs) am in need of a little direction. �i
checked �& replaced
bad tubes, verified b+ v. �2 problems, may be related???
on top band,
very poor reception, & when u adj ant. control, u hit a
spot that
causes oscellation or motorboating. �prob #2...on top 2
bands, cw sigs
have a raspy note. �not t9 at all. �it is a high s/n
rcvr 6377. �kind
of neat, has spinner knobs, noise blanker, & 455 kc if
brought out to
rear apron. �i guess previous owner did mod, but it sure
looks
factory....solder connections, etc.
� � �would appreciate any and all guesses.
� � �tnx, pete, k2iqk

hi again, tnx for the replies..i did clean all wafer sws &
pots,
didn't clean main tuning cap..have bama prints for rx..will
try
voltage & resistance checks..full alignment sounds like a
good idea..i
have sig gen..1st & 2nd ifs would be difficult because sig
gen calib
not great..i dont think if alignment is my main prob..but
will do all
hf aligns..i'm glad to get back into tubes..its like
restoring a
classic car, but alot cheaper...hi hi. tnx agn..if u have
any more
ideas, pse email me.
73, pete

I should have added to watch out for the power supply
filter caps also. Bad caps could account for the hum and
rough CW notes plus allow some feedback through the power
supply although at RF the by-pass and decoupling caps should
prevent that. Try the power supply filter caps first.


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Richard Knoppow
Los Angeles, CA, USA