{Collins} KWM-2

Have several KWM-2's.  One of them has a "dual" RF gain control.   It has the 
"standard" RF gain, and also a clear plastic ring beneath the regular 
control.  It does not appear to be an add-on or a modification.  Looked inside and 
both have pots wired to them.  The clear plastic control does not seem to impact 
the gain much--if at all.   Have not seen any reference to the clear plastic 
control in any of the manuals.  Is an early serial number KWM-2.  Can someone 
tell me what I have?   Thanks.


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