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You can do that. I chose 50 because it's nearly double the normal voltage at the regulator output and will work fine for many years. A capacitor is a charge storage device, sort of like a mini-battery, but without a fixed terminal voltage, so you're right that whatever voltage if applied to it...

I think the main purpose is to smooth out the output of the regulator, especially if the battery isn't up to the job. Anyway, I've never paid $58 for capacitor in my life, and if I need to replace C1 in my 003A I sure won't do it without a big fight. :-D

OK, thanks, I looked it up earlier. It's C1 in the schematic, a 50 uF 75 Volt non-polarized tantalum capacitor from the output of the regulator to ground, and it is indeed a very expensive capacitor. Tantalums have especially long lives, and are good at absorbing a wide band of noise, but in...

Point me to a page in the parts list, or to the part in the schematic, or both, and I'll try to help.

If you're a ham and operate in the HF bands, the filters might come in handy.