[dseverson]

Touched pin 5 on 6F6 with the tip of a screwdriver but did not get a hum. Measured pin 8 on 6Q7 and got 0 ohms. Touched the grid cap of 6Q7 and wiggled it but there was no change. Pulled the grid cap off 6Q7 and touched the top of the tube but did not get a hum. This thing is making me nuts. I am thinking there is some problem with the 240k resistor that is soldered to 6Q7 and runs through a hole in a tab in 6F6 and is soldered to 5W4. Whenever the resistor's wire touches the tab in 6Q7, the hum goes away and I get a low volume pop when I touch the top of 6Q7. I don't think it will help but I'll insulate the wire.

I'm still trying to locate the 350 and 50 ohm resistors. Either I'm blind or they aren't there. Tomorrow, I'll post a picture of the underside of the chassis.