[TenTec] C-21

[Ed]

George Allgood wrote:
> 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

R1 controls the sidetone frequency. It will be either a 68k or a 47k. I 
put a variable pot in temporarily to determine what I wanted. Measured 
the pot and used a fixed value.


Ed W3NR