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When I joined Moto out of school in 1966, they were well into the all-solid-state design -- have to look through my adverts collection to get a date of when they were first sold, but it may be 1966.
Moto did a lot of development of the solid state horizontal sweep and high voltage. If you have seen the Varo-built high voltage rectifier they used, you will recall it having two tapered fins on the sides. These were not only for heat dissipation, but also to equalize the capacitive current among the many (100 or so?) lower voltage diodes that were stacked up inside. Moto also did a lot of work on the high voltage, high speed, large-safe-area horizontal output transistors. For the large screen sets they still had to use two in parallel, plus do a lot of black magic in the chassis design to survive CRT arcs.
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