there is transistor or regulator on TO3 heatsink. likely four identical units - regulated power supplies (with V and A meter). each unit has two knobs... either voltage coarse and fine adjustment or voltage and current limit. there are +-GND-- terminals below knobs:

View attachment 357641

same thing as modern versions, but retro!
View attachment 357642

I do believe you nailed it.

Ron

 

i am guessing TS is interested what to do with it or what the market value is.

i am not sure... probably beer and pizza, unless some museum or enthusiast wants it.
it used to be awesome, but it is just too dated, low spec, and bulky for today's standards.

 

In about 1978 I built my first personal computer. It probably weights 150 pounds. It was in three rack metal boxes. Then you needed a separate terminal (keyboard & CRT monitor) to talk to it. (used a teletype for a while) It is worth scrap metal price now.
My wife just got a new computer. It has 200,000 bigger hard drive. It has about 200,000 more memory. I can carry it in one hand. Cost a fraction of my first one.

Here is an oscilloscope that is 4x faster and much much better. It includes a meter. $99.

Here is one that is 10x faster, does many things not thought of. $180. Has a handle on top and can be carried by one finger. For a little money you can get a built-in signal generator and voltmeter.

probably beer and pizza

I hate to say it but give the beer to the scrap metal man. I know the governmant probably paid the price of a small house for it.

 

Classic stuff. Everything is mounted in an old standard 19" rack panel. You can Google the part numbers but the top is an old MX2930 / USM-105 Oscilliscope w/ vertical plug in. The plug in vertical channels were common. My guess based on looks is it is a HP manufacture scope. Further down is a pretty cool Mega Cycle Electro Pulse generator. Note the reference to MegaCycle which today would be MegaHertz. This was before we better defined those terms, much like we used the term MegaHertz to define as CPS (Million Cycles Per Second). This is the stuff I began my career with. While the original owner was a Ham this stuff was just TMDE (Test Measurement Diagnostic Equipment). The rack for power supplies is empty. You may want to yank out the panel with a bunch of meters and look for an identifying tag. My guess is a voltmeters with selectable gain. I would fire up the scope and see if it works.

Ron

The 19" rack is really the best thing there. Strip the old gear out for donation or scrap, clean and repaint the rack for a nice computer/gaming gear display.

https://www.amazon.com/Pyle-Circulation-Cantilever-Universal-PLRSTN14U/dp/B01HTG4WHY?th=1

 

Yeah, have to agree. I remember as a kid trying to find rack mount cabinets.

Ron