Army Signal Corps Machine

[mojjax]

I was wondering what this was used for ? How old ? Or any other info , thanks much !

it is quite heavy.

 

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[dg39]

I think you have a power supply to one of the old wall projectors. From the controller's it operated two of them.. Just a guess.
DG

 

[whynot]

Amplifier for presentations/movies. Incoming signals from microphones, phonographs and projectors output only a few watts of power. Your amplifier would take the incoming signal (selectable by switch on right) and output the amplified signal to output and/or monitor speakers. Not quite sure about the "bridge input/output", but may have been used to patch mono to dual speaker output. Also not quite sure about the "Change Over" connector, but maybe a wired remote control to switch between projectors
I'm guessing late 1930's - early 1960's... Shock mounting suggests maybe used in the field? Maybe for USO type shows or just for tent use at a military camp...
-whynot

 

[Ramitt]

here is the manual for the projector set
http://tinyurl.com/yhe8rz4

 

[mojjax]

Thanks for the info ! Unfortunately I have 2 of them .