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OK, so it seems that I didn't do too badly, but my work is cut out for me. Indeed there is only one loctal tube and it's a goner at about 40% emissions. I really appreciate that drawing TUD1. If I interpret it right it looks very simple in that you simply wire in the two 1N4007 diodes' anode where the plates would be; eliminating them (plates) from the circuit. On the other end it's solid state diode cathode to chassis ground. The heater string resistance is in the left in circuit tube for originality.
If I have that right I may just do that on this set and an evidently pretty rare Silvertone set that I have with the 6X5. It's a 4663 model and IF I find them they are super pricey by my standards. I don't know if that says a lot, but I sure don't want to fry it. My beloved Hickok 209 VTVMs use them as well.
Thanks all for chiming in. I see I'm not in this alone as Electronic M is on board. A good man to have beside ya in a radio/tv foxhole!
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"Face piles of trials with smiles, for it riles them to believe that you perceive the web they weave, and keep on thinking free"
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