Re: Combined power-pentode and double-diodes?
Quite recently I remember reading a write up in the Wireless World about the E/UCH21 and it's release from Eindhoven. They stated that it was going to be the start of limiting the types of domestic valves in broadcast receivers to a few simple types.
Circuits were given for it's use as frequency changer, another for I.F. amp, L.F. amp with a E/UBL21 in short superhets as a detector/output valve and a UY21 rectifier.
They also put the later B8A E/UCH42 to all sorts of use in both radio and TV receivers. As with all Philips products they worked outstandingly well. I can't remember the WW edition but I'm sure someone may have better indexing than me! John.
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