Tacos mystery challenge

[Bob Bruhns]

It's some sort of phase splitter.  I'm not sure that it would be hi-fi 
in nature.  Maybe it functions as a balanced modulator if audio feeds 
into terminal E and some carrier signal feeds into the cathode circuit 
through terminal F. Terminal F would need some kind of DC path to the 
negative supply.

    Bob, WA3WDR


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