09-08-2014, 08:25 PM
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
Again, I'm dumb on this stuff.
Jerry
A friend in need is a pest! Bill Slee ca 1970.