[Collins] Wanted: 32S-3 VOX Time Constant Pot

[Dr. Gerald N. Johnson]

Of the usual suppliers, Digi-Key admits to a 10Meg pot, but has none and 
has a minimum order of 250 units. Made by Honeywell. I didn't search for 
that Honeywell part number.

http://www.potentiometers.com/series70.cfm State Electronics claims to 
have parts in hand to assemble any quantity of pots to specification, in 
a smaller package than the original (I think) in most any quantity. I've 
not asked for a quote which is the way to make them show their hand.

Work arounds, near cobbles. Solder a 10 to 22 megohm resistor in 
parallel with the pot. That will move the operation point to a new place 
on the pot so it might make contact again, but if the resistance element 
is open end to end that won't help.

Replace the pot with a 5 meg pot, more readily available and add a 
second time constant capacitor doubling the capacitance of the circuit. 
That's C119 in my 32S-1 book a .047 paper, if that's not been replaced 
by an orange drop, its leaky and affecting the time delay adversely. Go 
to a 5 meg pot and a 0.1 orange drop or other quality polyester 
capacitor. This may slow VOX attack slightly. Simply adding capacitance 
will move the operating point to allow using the original pot a while 
longer.

Move the wire from one end lug to the other end lug reversing the 
rotation of the pot to move the operating point.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.

On 4/10/2011 6:02 PM, Bob and Sue Jefferis wrote:
> Greetings:
>
> I am looking for the 10 Meg Ohm VOX time constant pot in good operating condition. The 32S-3 and 32S-1 designator is R86. In the KWM-2 it is R43. These all bear the Collins P/N 376-7206-00 (or-000 on the end). As far as I can determine, current production offerings from the main distributors stop at 5 Meg Ohms. Thanks.
>
> Bob, KF6BC
>