UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Combined power-pentode and double-diodes?

Heatercathodeshort · 30th Nov 2022, 12:01 pm

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.

30th Nov 2022, 12:01 pm	#22
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	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.