Quote:
Originally Posted by bandersen
You can use any CRT that will fit and has the same base pinout. 10BP4, 10FP4, 12LP4, etc. Bigger issue is mounting and supporting it. You'll also need to modify the HV connector.
Both 5U4 filaments should be wired in parallel. More likely there is leakage between windings than it is open. You could check it if you have a megger or leakage tester. Some devices like the Sencore PR-57 have a leakage tester built in.
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Unfortunately I don't have a leakage tester, I do have a capacitor checker from the 1930s that tests for leakage in capacitors but I'm guessing that's not the same thing...
Also if the winding in the power transformer for the 5v filiment turns out to be fine (not open, but maybe slightly leaky) would it be fine to just reuse the original transformer's 5v Filiment winding, the less modifications I have to contend with in this set, the better.