[Milsurplus] Intercom amp

[LARRY D GODEK]

I have here an intercom amp, i think, uses a pair of 12A6 and 12J5 tubes.  Has a single knob, switch and plug with 8 pins on the front.  Looks like it would fit into a command set rack, same dimensions but it has no connector on the back.  No markings on it as to what it actually is.  although it's about the size of a command receiver.  Any ideas as to what it actually is?  

I picked it up out of the boneyard years ago and thought i might play around with it, running a command receiver thru it.  I think the knob on the front which is 4 position may be for setting the gain.

That's all i know.

Larry
W0OGH