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[AMPS] SB-220 Problems

To: <amps@contesting.com>
Subject: [AMPS] SB-220 Problems
From: measures@vc.net (Rich Measures)
Date: Wed, 30 Dec 1998 03:40:33 -0800
>
>I've run out of ideas and could use some suggestions that may help to rescue
>this SB-220 of  mine.
>
>I had a catastrophic failure a while back due to Zener diode shorting that
>set off a chain reaction on other components. 

Chain reaction?  .  Shorting / unshorting my SB-220's Zener diode with a 
clip lead did nothing except change the ZSAC by a hundred or so mA.  One 
explanation for the Zener failure  can be found in "Circuit Improvements 
for the Heath SB-220 Amplifier" in the Nov/Dec 1990 issues of *QST*.  
-  later, Walter


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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