There was a pot on the bottom of the C21 you access through a hole in the
bottom. This was for sidetone volume. I just can't remember if there were
2 pots with one also being for pitch. The original Omni series had 2 pots
on the bottom.
Carl Moreschi N4PY
121 Little Bell Mountain Drive
Hays, NC 28635
www.n4py.com
----- Original Message -----
From: "George Allgood" <myp4k69@bellsouth.net>
To: <TenTec@contesting.com>
Sent: Friday, August 21, 2009 2:52 PM
Subject: [TenTec] C-21
>
> Recently, I found a Century 21 and let it "follow me home".
> Rebuilt the PTO and cleaned her up a bit and now, she's working like a
> charm.
> I'd like to change the frequency of the sidetone. The sidetone is plenty
> loud enough,
> but the pitch is a bit low. The tone is generated from an IC on the
> pre-amp board.
> Has anyone done this?
>
> Thanks
>
> George, W4GFA
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> TenTec@contesting.com
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