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Old 17th May 2021, 11:30 am   #369
FERNSEH
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Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Baird T5 restoration project.

Hi Andy,
TSE4 secondary emission valves have a very high mutual conductance figure, 15mA/V, same as the EF184 frame grid valve.
However, but it's not just the gm, also important is the input resistance at VHF.
The T5 employs conventional RF pentodes in the receiver unit. Safe to suggest that the TSP4 is a rebased Philips 4673.
https://www.radiomuseum.org/tubes/tube_4673.html

DFWB.
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