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FERNSEH · 13th Jan 2018, 9:54 pm

Check R512 (100K) which supplies the line flyback pulse to pin 5 of the TDA920. Also the phasing pot R513. Adjusts the mark-space ratio of the line drive waveform.

DFWB.

13th Jan 2018, 9:54 pm	#5
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Philips 570, a cheapo Pye in disguise! Check R512 (100K) which supplies the line flyback pulse to pin 5 of the TDA920. Also the phasing pot R513. Adjusts the mark-space ratio of the line drive waveform. DFWB. Last edited by FERNSEH; 13th Jan 2018 at 10:00 pm.