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That last one looks like a possible "plug and play". Thats a phenomenon I have discovered in collecting old tv's. Once in a while you find that set that was well taken care of and above all more than likely never left dormant for so many years that the capacitors didnt get too far out of whack! You get it home and do a "slow warm" with your 100 watt light bulb rig and the old thing fires right up.
Dormancy factor is a key factor I believe. My two best working originals I have owned since the early 80's. One at least I know that a fellow then in his 60's kept and used regularly until my purchase. Thats the Sparton. The other I'm not sure of previous owners but I do know that it was used regularly enough to earn it a crt booster. This is my 56 Philco that I used regularly as a teenager. $10 and working in 1983 and working ever since. So both sets up to this day have never gone with zero use, only ocasional use. By now the Phico's poor veteran 21ZP4B is getting a little dim but still well watchable after several minutes of play.
I firmly believe that the occasional use is the key, like vitamins and exercise to the human body. Really if you think about it a lot of stuff works like that. What about cars? Let one sit, next thing you know it is a clunker.
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