It would be nice if they had reverse switches on one, lol. That is ampguts picture but I can tear into mine later and tell you. They are kind of a pita to take apart as you can see. I should find some of those RCA terminals and drill the case, mount them in. Keep using a DIN to RCA dongle....in fact if I built a box for this I could power it off the DIN cables and not use RCA, unlikely I would use it on another set of amps anyway.
It looks like upc1225H, not 100% on the 5 but 95% on it. Had to take it apart and still has stuff on it that will not come off.
http://www.datasheetcatalog.com/datasheets_pdf/U/P/C/1/UPC1225H.shtml
http://www.datasheetcatalog.com/datasheets_pdf/U/P/C/1/UPC1225H.shtml
It wouldn't be quite as easy as simply moving the input signal to the other pin. If the circuit was similar to the 3550, you'd have to remove the signal from the + input and ground the +input. Then you'd have to change the value of at least one resistor and one capacitor before connecting the signal line to the - input.
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