Re: 5FP7 project starting with the focusing coil.
The RSGB-manual SSTV monitor using a 5FP7 has this circuit to generatre HT for the tube, using a LOPT with the feed to the scan-coils removed.
The potentiometer varies the mark:space ratio of the oscillator and hence the HT.
These days I'd look to doing it using a 555 and a switching transistor scarfed from a SMPS.
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