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philco 80 jr. help please. 1st time restoring a radio this old
#53

Your making real progress LC. There really shouldn't a "noticable" hum but if your fine with the volume to a listening level, that's great! I would still try the 10mfd cap across the resistor from the center tap to ground. As indicated, that resistor sets up a negative voltage to bias the amp. It needs to be a clean DC and the earlier schematic that used it seems to make sense. Any ripple in this will add some hum.
Again, I'm dumb on this stuff.
Jerry

A friend in need is a pest!  Bill Slee ca 1970.


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RE: philco 80 jr. help please. 1st time restoring a radio this old - by jerryhawthorne - 09-08-2014, 07:25 PM



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