UDT Model 201A Amplifier..
The UDT 201A is designed for use with detectors operated in the phoconductive mode. (reverse biased).
Frequency range is from dc to 5MHz with light detection sensitivity down to 10-7 watts. Power supplied by two 12.6V mercury batteries...

Item is in original box, appears new and unused. Amplifier will still be sold as is with no right of return as we are not able to test this item.

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