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Maarten · 5th Mar 2018, 2:11 pm

Not bi-ampli but a similar output stage to that which some bi-ampli sets use.

The last OTL output stage in a Philips set was probably in the F6 TV chassis produced up to 1972. That one employed a PCL86 as the lower valve and a PCL805 as the upper valve.

5th Mar 2018, 2:11 pm	#10
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,199	Re: Interesting TV audio amplifier. Not bi-ampli but a similar output stage to that which some bi-ampli sets use. The last OTL output stage in a Philips set was probably in the F6 TV chassis produced up to 1972. That one employed a PCL86 as the lower valve and a PCL805 as the upper valve.