Victoreen Instrument Co.

CDV 715   model 3a   1962

High range instrument - .02 500 R/hr. ~ Radiation Detector ioniziaton chamber ~ Batteries 2 D cells ~ I subminiature triode vacuum tube, 1 transistor ~ Controls range switch circuit test, off, 0 - .5, 0 5, 0 50, 0 500 R/hr. meter zero control ~ Yellow metal case.  Replaced earlier high range detectors.

This was the best and most widely used high range radiation meter.  The grid leak resistor (glass incased) on the tube is a whopping 220,000,000 ohms and the tube and switch circuit have to be spotless and totally dry for this instrument to function.  No where else have I seen a resistor this high - ever!

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