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Those old paper filter caps in late '20's early '30's radios are often OK. Cheap electrolytics came along just a bit later. If it works without hum you can leave them in. I think maybe I'd put a fuse in the centertap lead from the HV winding of the transformer. If you decide to go electrolytic, just cut the wires to the old caps and install the new little caps under the chassis. You can go a bit larger on the new caps: for example if the old ones are 4 or 5 or 8 mfd you can go 10.
Not sure if on this radio or is it Spartons, where the power supply chassis and maybe the speaker and main chassis are NOT screwed into the cabinet and just slide around inside so have to be careful moving them?
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Reece
Perfection is hard to reach with a screwdriver.
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