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In regard to the moto JA sets....I think the biggest problem is that techs were NOT used to a SMPS power supply back in 1971. It must have been a LOT of fun checking a board over, finding a shorted SMPS out transistor, changing it , and applying power, just to hear that POP!! the instant you powered the set up--due to a shorted load or stuck oscillator. Keep in mind--these guys were still seeing totally tube sets EVERY day....and any SS sets was still strange to them.
Today--that JA SMPS power supply is old-hat--and most of us who have worked on sets for the last 30 or so years would find it's circuitry pretty familiar--and easy to deal with. A relatively simple forward-mode switcher, with horiz. rate locking. I recall fixing a few JA sets, one was a 19 incher. Have NOT seen one in over 25 years though !!
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