Re: UY41 Valve.
The UY42 was supposedly designed to half wave rectify 110V mains, but looks suspiciously like a remarked UY41 to me. It may even have been a way for Philips to dispose of substandard UY41s.
I can't see why a UY41 wouldn't work perfectly well as a UY42 substitute, though subbing a UY42 for a UY41 would exceed the UY42's voltage rating (if that's to be believed).
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