Re: 5FP7 project starting with the focusing coil.
Looking at what you're doing - If you haven't already done so I'd suggest you visit the late-1970s RSGB "Radio Communication Handbook" and its section on 'image communication' which includes a design for a SSTV monitor using a 5FP7, the circuit to produce the EHT, and schematics for the line- and frame-scan drivers [both using vintage Germanium AD161/AD162 transistors].
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