Yelostn78,
if you look in the tips section, you will see that I have a writeup on how to test it without doing damage. As far as hooking it up, connect the black lead of the trickle charger (6 Amp) to the chassis and the red clip to the power lead on the radio. Plug in a car radio antenna and that is it for the connections. You can substitute for the antenna with a 3 foot piece of hookup wire with about 3/8" stripped bare. Insert that end into the tiny hole in the antenna socket.
These radios are quite valuable even in the unrestored state.
By the way, some of the vendors are selling "new" OZ4s which are really a solid state conversion. As far as testing tubes, normally one would use a tube tester. However that may only be necessary if you suspect one has a problem.
I would be happy to answer any questions and help guide you through the trouble shooting and repair.
