[Test-Equipment] Battery cover for General Radio 1650-A

[Richard Knoppow]

----- Original Message ----- 
From: "Richard Knoppow" <dickburk at ix.netcom.com>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Tuesday, June 01, 2010 8:00 PM
Subject: [Test-Equipment] Battery cover for General Radio 
1650-A


>      I recently aquired a General Radio 1650-A impedance
> bridge. The cover for the battery compartment is missing.
> While its possible to make one I would like to find an
> original, if possible, so I wondered if anyone had one in
> their parts collection.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com

     FWIW the gasket on the cabinet was gone. I found that 
automobile door edge gasket as sold by Pep Boys is virtually 
identical with the original. It comes in packages of several 
about three foot lengths, one of which is enough for the 
case with a couple of inches left over.
     I also found that the Orthonull mechanism was slipping. 
I was able to get it working by adding a second spring to 
the clutch mechanism. Probably the real cause is wear on the 
clutch but this works and finding the right kind of cork for 
the clutch face might be difficult.
     These are neat bridges and the Orthonull does make it 
easier and faster to measure low-Q and high-D components.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com