[Collins] 32S-1 grid problem found

[Gerald]

On Fri, 2005-12-02 at 18:58 -0800, Glen Zook wrote:
> I found the source of the reverse reading grid meter
> in the 32S-1 that I have been working on.  There is a
> feed through (not a feed through capacitor, just a
> feed through) that connects the grid coils with a
> piece of miniature coax that goes to the
> neutralization capacitor.  Somehow that feed through
> had developed into a resistor with about 650 K ohms to
> ground instead of being basically infinity.  This feed
> through is located at the rear of the chassis under
> the tuning rack.

Teflon feed through? Or phenolic. I can't find it in pictures above or
below chassis in my manuals. I do see the coax in them. The 32S-3A
manual has lots of mechanical parts but I can't yet detect that one.
> 
> Someone had thought that one of the fixed capacitors
> in the grid circuit was bad and replaced it not doing
> that good of a job in the process.  However, the
> capacitor connections were over an inch away from the
> feed through and the feed through had not been
> touched.
> 
> Now to find a feed through to replace the bad one.
> 
> Glen, K9STH
> 
So, is the schematic still different or has it been just complicated by
the prior repairs?


-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer