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Old 2nd Oct 2019, 10:08 pm   #96
FERNSEH
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Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Bush TV22 with TC184 B3 converter.

Hi Peter,
The negative going pulse is the waveform that's always present at the anode of the blocking oscillator irrespective of there being a sync pulse or not.
The blocking oscillator requires a positive sync pulse at the valve grid to initiate the flyback. A negative sync pulse can be applied to the anode and the transformer will act as an inverter so that the valve grid receives the positive sync pulse.

DFWB.
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