[Heathkit] HW101-Trouble Shooting Techniques

Tue, 7 Jan 2003 15:50:35 -0500

 I'd try subing the audio output tube.

Mark  WB8JKR

On Tue, 7 Jan 2003 08:44:18 -0600 "Ben McKinney" <[email protected]>
writes:
> 
> 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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