[Jamie]

I'm still trying to solve the problem of my Philco 620. It has a terrible hum. The radio was previously repaired and I've corrected a few mistakes.

There are three electrolytic caps - (two 8mf and one 16mf). Right now, all three are grounded to the chassis, because that's how they were when I got it. I think this is wrong and it's the source of my hum.

When I look at the schematic, I see the 16mf (part no 52) grounded to chassis, but the two 8mf (part no 67) grounds go somewhere else. Am I correct? And if so, where do I run the ground from the two 8mf caps?

http://www.nostalgiaair.org/PagesByModel...013804.pdf

Thanks