[Chad Hauris]

I have an industrial model CTC-39 that has a grounded power cord as it comes from the factory. The socket is similar to the usual cheater cord only it has 3 pins.

When you hook up your new socket, the grounding lead (green lead or the terminal connecting to the ground prong) goes to the chassis. This will improve safety because the chassis can never rise above earth ground potential like if your power transformer were to short to the case..you'd end up blowing your circuit breaker rather than getting shocked by a "hot" chassis.

Only thing to watch out for is make sure all the components in there such as the tuner and CRT are grounded well to the chassis, so a voltage difference between metal parts can't occur. This is especially important in devices like jukeboxes where there are a lot of electrical sub-assemblies and if you grounded one but not another, the un-grounded one could have some leakage current that would give you a shock if you touched it and a grounded component at the same time.

Also a fuse in the power line would be a good idea, probably a 5 amp would be good....seems like this set has a circuit breaker in the B+ circuit but a fuse would be good extra protection.