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Maarten · 4th Jan 2019, 10:34 am

Philips used this output stage topology in several radio and TV models from the early 1950's up to about 1971 (B/W TV), with pentodes instead of triodes. They developed a range of 800 ohm loudspeakers for it.

4th Jan 2019, 10:34 am	#18
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,203	Re: Puzzling audio circuitry Philips used this output stage topology in several radio and TV models from the early 1950's up to about 1971 (B/W TV), with pentodes instead of triodes. They developed a range of 800 ohm loudspeakers for it.