Shortly after acquiring this set, I traded it away to another collector. Recently, this other collector contacted me and offered the set back. Having regretted making the deal ever since I moved the Hoffman in 2014, I jumped at the opportunity. I'm now both the 2nd and 4th owner of this set.
Anyway, the fellow that had it in the interim did a recap on it and got the set about 80% restored. It has poor sync. Part of the issue was the 6V6GT vertical output tube. It was gassy. I think the other major issue is the contrast control. It's a 500 ohm potentiometer tapped at 75 ohms. The one in the set is shot. The contrast control is in the cathode circuit of the 12BY7 video amplifier. The signal going to the sync separator (the triode section of a 6U8) is picked off from the plate of the video amp. If I can't get clean enough video to the sync separator, it doesn't matter what's going on down stream of it. In addition, the -12 volt supply for the 6AV6 audio amp is picked off a resistor network tied to the contrast control. Basically, without a new contrast pot, I have a very expensive paper-weight. Does anyone here know where I could find a replacement pot, or how I might modify the circuit to use a normal 500 ohm untapped pot?
Here's the schematic of the video amplifier:
