Need help identifying purpose/function of unknown tube amp

[Sunstang]

I picked up this unmarked tube amplifier (I think) from a thrift store, thinking it was maybe an old keyboard or organ amp and might be able to be modified/used for guitar. On further inspection, I can't make head or tails of what it does, what the appropriate tubes might be, or whether it's worth pursuing a refurb. Any assistance or insight is appreciated!

Mystery tube device https://imgur.com/gallery/tHZpZ

 

[gadget73]

pretty big transformers there. I think you'd really sort of need to sketch out a schematic to try and work out what its about. Could be a lot of things, but I'm guessing mono amp with tone controls and possibly a mic input stage.

 

[Tinkerbelle]

From the underside there are two 1/4" jacks disconnected from the front, presumably the inputs. The terminals marked "6", "7" do not appear to be connected. Terminals "P", "O", connect to the transformer (OPT?) and also to the octal socket on the rear presumably the output (speaker or ?). Power seems to come in to the fuse connector and front selector switch (power switch & volume?).

It looks like the PT connections also go to the one octal socket that is between the two cap cans, so presumably for rectifier tube. Two PT wires go to one of the other (pair) of octal sockets, which connect across to the other octal in that pair, and the connector pins could be 2 & 7, so possibly heater of 6V6 or 6L6 type tubes in push-pull - although I am only seeing one coupling cap . Maybe a PA or instrument/measurement amp...but need to look closer to try to follow the wires,

 

[johnblue]

it looks like a homebuilt p.a. amp, that at some point, someone else molested and used for something else.

basically, its a full do-over, using the chassis, sockets and transformers and knobs.

whatever it is, it looks like a great find, and my bet is that a good tech could make a guitar amp from that pretty easy, but its going to take some time on the bench just to test the transformers to see what needs to be done. after that, i bet it falls into place quick in the right hands.