"Jeff Liebermann" wrote in message
...


I'm still slightly mystified how the components looked like they were
properly soldered, while the solder didn't stick to the PCB pad. The
best I can offer is some grease on the pads. Also, it was only in one
part of the PCB (around the RF connector). The other half of the RF
board was just fine.

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Showing my age, I worked on a tube TV which had a red hum bar floating up
through an essentially normal color picture. The ground on the R-Y amp tube
heater needed to be resoldered. It was a quick fix after hours of fruitless
troubleshooting. (A high resistance joint caused the 60 Hz A/C voltage to
be coupled onto the cathode, modulating the R-Y signal. Oddly, the tube was
lit, keeping us from looking where the trouble lay.)