Ever wanted to build a tube Video modulator?: the Custom Electronics corp model 3A

[Electronic M]

At the October ETF swap meet I bought this tube video(only) modulator.



I tested it out late last night and was rewarded with a basically perfectly functioning unit despite 4 original lytics, 2 foil caps, and original seleniums.
I was able to get roughly 50-75' of range with it driving a simple pair of rabbit ears (it'll likely do better with a tuned dipole).
A good look at the circuit reveals no odd ball/hard to source parts so this could likely be copied by hobbyists. It would appear that perhaps all that would need to be made is the osc. transformer, and that looks like a walk in the park to make....I'd wager an experienced Ham or engineer could easily modify the osc. xfmr to work on channels other than 3 and 4, and the unknown value RF chokes likely are not critical in value..... Below is the schematic.


All that it could use is an audio modulator section....I'm open to ideas on how to implement it. I initially thought the two tied together inputs may have been for a separate audio modulator that would mix with the video, but that seems unlikely considering that they used to daisy chain many devices along some video lines back then, and the dual input jacks are likely for that rather than two different input devices.