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Re: [TenTec] Corsair II buzz

To: <Gary@doctorgary.net>, "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Corsair II buzz
From: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 2 Apr 2009 09:50:37 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
First, I'd say the Ultra Low ESR caps are likely overkill.  As to the buzz, 
does it exist with the volume control all the way down?  If so it is likely 
power supply induced otherwise, likely from the IF chain or product 

I'd find the source of the noise using an oscilloscope to trace the source. 
I've always thought it a bit helter skelter just to start replacing parts 
without knowing if a part is specifically at fault.  I've found too many new 
parts that are actually defective and when introduced into a circuit then 
leaves a person with the original problem and a new problem to correct.  I 
always reserve the "shotgun" approach to bird hunting unless your name is 
Dick Chaney.

Bob, K4TAX

----- Original Message ----- 
From: "Gary Smith" <Gary@doctorgary.net>
To: <tentec@contesting.com>
Sent: Thursday, April 02, 2009 9:01 AM
Subject: [TenTec] Corsair II buzz

> I've got a Corsair II I'm planning on recapping with Ultra Low ESR
> electrolytics. There's a high pitched buzz I can hear which is
> distracting somewhat but is mostly absent when the narrow filters are
> engaged.
> It was there when I sent it to the factory for repair several years
> ago and they found no problems but I notice it and it was not there
> on my Omni and is not there on my other radio (not a Corsair).
> Any suggestions of which board I might start replacing the caps on to
> eliminate this noise?
> Thanks!
> Gary
> KA1J
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