Audio gain pot needed.

[Jan Ditzian]

Ken,

I recently added a standby switch to my SB-201 and needed a pot and 
switch similar to what you need (I wanted linear taper).  Mouser has a 
push-pull switch and pot, but the shaft is slightly smaller than 
standard, I used alpha 313-1600F-xxx.  If you look at the figure, you 
will see a notation of P-P.  This is a 16mm shaft.  I think that 24 mm 
(alpha 31M series) may be closer to what you want in size, but you can 
see in the figure that the switch on the back looks like the standard 
end-of-rotation switch.  The figure near it does not mention P-P. 

I chose to try the small pot with the P-P switch.  The SB-201 knobs use 
a set screw and have big skirts, so the difference is not noticeable and 
does not affect function.

By the way, I ordered this over the telephone and I asked the 
salesperson whether the switch for the 313 series was at the end or was 
push-pull, and she did not know; she then summoned a tech, who said it 
was end of rotation.  So much for expertise, it was push-pull, which was 
what I wanted anyway.  The push-pull is only DPDT, so you can choose 
whether you want the on position to be in or out.

I have not yet located a push-pull potentiometer in standard size.

Jan, KX2A


Kenneth G. Gordon wrote:
> I need several 1 meg, audio taper, standard size controls, with 1/4" 
> shafts, but they have to have a PUSH-PULL SPST switch mounted on 
> the back of them.
>
> The switch cannot be one that comes on as you rotate the control from 
> full CCW.
>
> This is to replace the audio gain controls in my HW-101 and SB-102 so 
> that I can enable FAST/SLOW AGC without drilling another hole in the 
> front panels.
>
> I did this years ago to my SB-101.5 and it works very well.
>
> Could anyone point me to a source, please?
>
> Ken Gordon W7EKB
>
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