Can I replace a King KT76 with a KT76A in the existing tray.

Our King KT76 transponder has gone down, but I have a KT76A !
A friend has advised that a KT76A is a slide in replacement for the KT76.
I doubt that he is correct, but I am sure the knowledgeably guys and gals on
this net will know the answer.

Assuming that I can't use the KT76A I would appreciate any recommendations
for a repair station that does not have $$$ss$$$ for glasses.

Thank all,

Roy
N5804F