[Jeffhs]

I have three of these radios (one is a TO 1000-1, the other two are TO 3000-1s) and would like to pass along a cautionary note:

Be careful if you have to rewire the wall-wart plug (the one at the end of the wall wart's output cable that plugs into the jack on the side of the radio). Zenith, for some reason I have never understood, wired the wall-wart plug (and its mating jack on the side of the radio) such that the tip is negative, the barrel positive, exactly the reverse of how most wallwart plugs are wired. If the wall-wart plug is wired tip (+) barrel (-), you will damage several transistors and other components in the blink of an eye, or even faster. I'm sure the schematic diagram will show this. I am not at all sure (in fact, I have no idea) why Zenith decided to design the solid-state TOs of the '60s with these oddball AC adapter sockets; it seems odd, to say the least, for any radio made in the US.