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A couple things I do, if replacing selenium with silicon, I would leave a term strip setup for a B+ dropping (and fuse for that matter if it does not have one), then use a variac and start at about 90v see how the set behaves (this is assuming its working). if everything working check the B+ at the output of the rectifier to the sams check the current and get a ballpark figure for the dropping resistor using ohms laws, prob between 50 and 200 ohms. check your line voltage and fine tune the resistor to the correct B+
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