• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

need a little help with identification

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Yo big H,
These are microphone preamplifiers that fit in a console and require an external power supply. Probably have excellent transformers. The pdf (1.75 meg) is a little too big for the forum. But it's on line here. Looks like they're missing a filter can as well as the tubes.
 
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