help replacing an old ac power transformer.

Hi. I have a very old transformer/power supply that blew that i'm
trying to replace.

All it says on the outer box is:

120vac
75 watts
50-60hz

The transformer has 4 leads...two reds and two blocks.

The transformer was made sometime between 1974-1979.



I went to Rat shack to buy a new transformer which has three blacks and
two yellows. Based on the way the wiring *was* setup I rewired the
transformer to the new one and flipped it on.. Nothing..not even a hum
or anything. The radio shack lists "center-tapped secondary" if thats
any help.

There is one black wire "loose" and I am unsure where it goes or if it
should go anywhere. There's nowhere else for it to go unless its
supposed to also connect to the ground (the ground already existed for
the plug to the box the transformer is in). Is that last wire a
ground?

Any ideas?

Thanks!

.

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