Re: Baird T5 restoration project.
Good progress today. All the 450 volt electrolytic capacitors replaced.
Three more electrolytic capacitors with more critical working voltages need to be fitted. The 16 microfarad frame timebase sawtooth forming capacitor was a post-war replacement, rated at 450 volts this too high for it's application in this part of the circuit. Correct voltage rating is 200 volts. It's likely the waveform across this capacitor is -100 to -125 volts P - P.
See first attachment, the capacitor is the huge component at the bottom of the picture.
Second attachment shows the progress made today. The two parallel connected 8 microfarad capacitors have been replaced by a single 16mfd unit.
The 25microfarad scan coil coupling capacitor will need replacing, as will the 2mfd frame oscillator valve cathode bypass capacitor. Voltage rating for this capacitor should be 200V.
DFWB.
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