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Old 20th Jan 2019, 8:41 pm   #80
FERNSEH's Avatar
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 6,392
Default Re: Baird T5 restoration project.

Testing the sound receiver. Using a borrowed power supplier set to provide 250 volts HT and 4 volts for the valve heaters. The audio amplifier consists of a Mullard 354V triode and a Mullard PENA4 output valve. That part of the circuit is working OK and there is some activity when the top caps of the FC4 detector and TSP4 IF amplifier are touched. All the B & I make capacitors are leaky and will have to be restuffed.

The loudspeaker is of the energised type.

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