Looking for a small, good receiver

Hi all,
First time poster here.

I seem to have run into a little problem with a set up I have. I just recently bought an old 60's record player credenza with the plan of completely ripping out the preamp in the back (doesn't work and doesn't offer an aux input) and replacing it with an old pioneer receiver I had lying around. My problem arose when I discovered that most receivers are too deep to fit into the back side of this credenza, so I am now trying to find something that will fit into the space on the top where the records themselves are stored.

This brings up the problem that I have about 14" across and 12" down for space for a receiver, and (obviously) most vintage receivers are at least 16" across.

I'm interested in an all-in-one solution, or something that's very simple and small because of the space consideration. All suggestions welcome.