Ts4d Motorola

[robert1]

Originally Posted by timmy

Ok clipped all on pin 2 of the 6sq7 and still got the hum, so I guess it's off to the b+ or b++ . Ground at the volume is intact.

Ok. If you replaced that 20 mfd capacitor off of pin 8 of the 25L6, did you connect the negative end of it to the same tie point as the original was?, or did you attach to the closest chassis ground?
the reason why i ask this is because the grounding for the entire audio is isolated from the chassis & connected to the B- rail. If you connected the negative of that capacitor to chassis, that could be the problem.
regarding the volume control, if the ground connection on the wafer in the control is open, it can cause the same problem. you need to disconnect the leads off the volume pot & check for end to end continuity, as well as continuity between the wiper contact as it is moved from one end to the other. i have seem many bad pots cause this problem.