Re: Suspect Mains Transformer in 1930s Radio P.S.U.
Presumably that is why the UU5 is much higher rated, bigger heater demand. Big jump from 1 to 2.3 Amps, thanks Lawrence, I didn't know that.
Can't think of another sub for 1821. You could build a plug in silicon diode substitute, then you could replace with a 1821 when you find one, needs that ballast resistor though.
How about a U10? There is one on ebay.
Last edited by Boater Sam; 20th Apr 2018 at 12:56 pm.
Reason: Added
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