STB #9 – What is it? Transmitter, Receiver, Amp, all three? None of the above???

This is an item I picked up out of the junk box at an electronics surplus store. I believe I paid $1 for it. It has 5 tubes but doesn’t appear to be an All American 5. It used type 30 and 33 tubes so we know it’s really early. I believe it was hand built in a re-purposed case. Looking at the coils it might be a low power transmitter though your guess is probably better then mine.


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