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

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Old 18th Feb 2008, 11:50 pm   #1
high_vacuum_house
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Default Philips 663 A EHT circuit

Hello there,
What type of EHT generating circuit is used on the Philips 663A television as I don't recognise it. I can see 2 HVR2 rectifiers in paralell going to a fairly small looking transformer (T5) although it does not look like a conventional line output transformer.

Christopher Capener
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Old 18th Feb 2008, 11:58 pm   #2
FERNSEH
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Default Re: Philips 663 A EHT circuit

The Philips 663A derives it's EHT supply from the 3KV pulse present at the anode of the EL38 line output valve. The two HVR2s serve as a voltage doubler. The EHT rectifers filament supply comes from two highly insulated windings on a heater transformer.

DFWB.
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