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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 16th Apr 2018, 5:13 pm   #21
rogerdup
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Default Re: PYE LV20/B18T 1948. Heart transplant.

Hi David,
This part always look tired on sets, but they keep working for an undefined
time until they give up.
I have a lot of spare wire to rewind them anyway for who need to..
Regards,
Roger
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Old 17th Apr 2018, 7:32 pm   #22
FERNSEH
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Default Re: PYE LV20/B18T 1948. Heart transplant.

The circuit of the Pye B18T and LV20 line output stage.
By using the recovered energy from the scan coils the PY31 boost diode supplies an additional 40 volts negative to the cathode of the PL38 output valve. Effectively increasing the HT for the output stage.

DFWB.
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Old 18th Apr 2018, 6:55 am   #23
Heatercathodeshort
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Default Re: PYE LV20/B18T 1948. Heart transplant.

Pye certainly had an odd way to list their components. C17A etc and to add confusion the printing in the manual could have been sharper. J.
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