Re: Philips 462A
Well done on persevering and completing, we've probably all succumbed to "back burner syndrome" with various projects. I like distinctive sets like this, much as I like the HMV1121 with its "glass venetian blind" speaker grill presentation- though both probably suffered a fair amount of attrition in their time!
Forgive me if I'm stating the obvious or teaching anyone to suck eggs, but is it possible that this replacement transformer has a 5V, rather than 4V rectifier winding, hence the originally found U50? At least, it would only take an appropriate small wire-wound heater dropper resistor to suit the AZ31 if so.
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