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those power supplies with constant voltage PT are nice. My zenith uses one as well. It has a VERY broad operating AC voltage, and its NOT solid state regulated (at least on the 25CD56 zenith). From what I understand its a very loosely coupled trans that is run in saturation contstantly (at least within designed input voltages). the output is more square wave than sine. Also the loose coupling results in lower current flow incase something does short out. In the case of the zenith IIRC reading about it, the current was limited to about twice the normal current flow in case of a short circuit. The trans runs hot by design. The motor starting cap can be a problem, feel it and see if its getting hot. I had a sylvania with that setup, it would pop the circuit breaker after running for a few min. That cap was very hot by then. I prefer the simplicity of that over the SS regulated power supplies found on the later model (zenith that is). I remember running it on a variac from 90v to 130v with no noticeable change in vert height or horz pullin.
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