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I would BUILD One. Use a small iso tranny-- rect. then filter the output and send it to a regulator--set for 90 volts. I am sure a zener for 90 volts and a 3055 transistor for the reg would work nicely. 200 mA or less of current should suffice.
for the fils....assuming 1.5 volts...use a 6.3 volt tranny at 1.5 amps or so-rect and filter it with about 6800'10 volt cap...--then get a reg ic--adjust it's output to 1.5 volt and post-filter with about 6800 mf of capacitance
ALL of this could be built into the cabinet--to not be visible from the outside.
Now--if you want to use batteries--use about 4 d dry cells..in PARALLEL. use this to power the fils directly. take the output from them and run into a small DC-DC converter--like used for neon blubs. schematics are readily available on-line. Regulate the output to 90 volts using a zener and 3055 transistor. Then post filter with about 470 mf /160 volts cap. This also could be made right into cabinet.
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