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I once had a Meck 7" TV. (well, I think it was a Meck, it has been quite a while since I owned it). Its HV was stable, but just would not go above 4KV no matter what I tried. Full recap, of course. Like the Hallicrafters, it used a 6C4. I built a little board with two 7 pin sockets wired in parallel which plugged into the 6C4 socket. When 2 6C4s ran in parallel, the HV was a robust 5KV. While this is not the same as the fading HV problem, it might be worth a try, and is simple to implement.
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John Folsom
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