[Heathkit] HW101-Trouble Shooting Techniques

[Ben McKinney]

Gang:
I am in the process of bringing an old HW-101 back to life and need some =
of your assistance and guidance.
The issue is associated with the receiver portion of the radio (have not =
begun the attack on the transmitter chain yet, ...coming).
I got the receiver up and running and honestly the darn thing sounds =
excellent, good sensitivity, good S meter / AVC action, stable, etc.  I =
have gone thru and replaced all of the electrolytic caps.  Have rebuilt =
the 23A power supply top to bottom Caps/ diodes, grounding, etc.
Here is where I need some help.  The crazy thing has a intermittant =
"crackle / frying" sound that comes and goes.  It is temperature =
related.  Over an hour it becomes very imtermittant.  I am assuming a =
Cap  / connection somewhere.  When the crackle is in,  turning the Audio =
Gain down and or RF Gain  down doesn't kill it.  I have tried the =
"freeze" sprays on boards / components and no real luck.  Here is the =
question...What search techniques could I try to narrow it to a =
particular area of the circuit??  I do have an O-scope.  Any other =
search and destroy ideas would also be appreciated.
In advance thanks for any help!...
73 Ben
K5HQV


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