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Old 9th Jun 2021, 5:40 pm   #373
FERNSEH
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Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Baird T5 restoration project.

Confirmed today that the scanning coils assembly in the Baird T5 which the subject of this discussion has four windings. The extra winding is used for sync pulse injection.
Further study of the frame sync circuit is called for but what is clear is the AC/HL triode is employed as a frame sync amplifier rather than as a sync separator valve.
It's possible that the TSP4 pentode functions as the line and frame sync separator.
The T23 has two sync separator valves. The TSP4 pentode for line sync and the AC/HL triode is the frame sync separator.

DFWB.
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