Professional Identification help needed!

I did get an old nuke gyroscope end bearing off eBay, once.

I bought it as it was made from machined beryllium, and no one knew what it was.

It’s an early 70’s mystery meat amplifier.

Kinda looks like a bogen, but it’s stereo... with more caps than any super tight bogen engineer would ever unwillingly squeeze out of their reluctant backside.

anyway, the lack of a face-plate or even screw holes/mounts for one, says it was always intended for a professional install application.

Which switches around the entire list of potential manufacturers.

The 5 amp fuse suggests an approximate 100 w/pc rating.