I had a 1964 Silvertone color roundie, like Electronic M's, that would lose color sync occasionally; however, on mine the color stripes were horizontal, not diagonal. I was able to get the color to lock by rapidly turning the tint control from one end of its rotation to the other. Never did find the actual cause of the trouble. All I knew was that the 3.58-MHz color burst oscillator was out of sync with the station signal; however, why rotating the tint control would bring it back in sync is a mystery to me even now, almost 40 years later. That set had several other problems besides, such as a hum bar that would float upwards through the picture, bad convergence I never did get right (I didn't have a generator at the time), and so on. Finally had to junk it when a tube socket broke out of a PC board.
