HH IC100L amp from 1977
Disconnecting the R-C of 100nF+4.7R (lag input A x2 pins of the TBA231
and B the same) from the 2x LM301 p1-p8 f-comp pins, returns something
like normal vol/tone function in comparison to ch1.
Will have to take some ch1/ch2/f comparison readings
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