[Heathkit] Re: HW101-Trouble Shooting Techniques

R.J. Keller [email protected]
Wed, 8 Jan 2003 10:22:10 -0500


Ben,
Had the same thing on my 100 and there is no easy solution but here is what I
did:

Removed all the tubes and applied Deoxit to all the sockets and worked the
tubes in and out. VOILA! No more noise. Still do not know which one but all
the troubleshooting was for naught when all I had to do was a socket cleaning.
Good luck and 73, Dick KF4NS
St. Petersburg, FL
Keep the glow!

Message: 1
From: "Ben McKinney" <[email protected]>
To: <[email protected]>
Date: Tue, 7 Jan 2003 08:44:18 -0600
Subject: [Heathkit] HW101-Trouble Shooting Techniques


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