{Collins} Need help identifying 75A-4 mod

I've had this A4 for years but never noticed this mod. There is pot behind the AM/SSB switch. The pot has a DPDT switch and is wired into the AM/SSB switch along with the pot. I can't find anything describing this in any info I have. Anyone have data on this or heard of it? I have not tried to trace out the wiring yet.

Thanks for the help.


Bill, K3PGB

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