Re: McMichael 381 Valve Radio project
Very broadly, 630v DC for the axial wax ones on the underside of the chassis. You may sometimes come across one or two rated at 1000v, often with values of or around 0.01uf.
For the smoothing electrolytics, which do not always need to be replaced, 500v should be suitable for most sets.
The voltage rating is always on the capacitor somewhere. For the wax capacitors it may be hidden under a layer of dirt which needs to be gently scraped off.
Gabriel
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