JANCRC931VA
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931 TUBE High-sensitivity, 9-pin side-window multiplier phototube (photomultiplier) engineered under military contract by RCA to detect ultra-low light levels and weak ultraviolet radiation. Equivalents: 931A, 931. Real-Life Examples: Scintillation counters, laboratory spectrophotometers, historical astronomical star tracking systems, nuclear radiation monitoring gear.
MARKS TUBES 62