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Two things that may be worth doing towards the end of fixing the low HV: 1.) If you haven't done this yet and have several good 1B3s try swapping different ones in (tube testers while good at IDing dead HV rects are a poor indicator of how good they will do in a set). 2.) If a tube rect does not help try an SS HV rect...They made SS plug-in R-3A3s that will work in place of a 1B3, or if that is hard to get 5KV (or higher) PIV rated diodes are inexpensive online I'd grab 3-4 5KV diodes, string them in series and install them in place of the tube...Elimination of the HV rect tube filament load from the fly by switching to SS rect may bring the HV to spec.
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