931A Photomultiplier Nine Stage High Sensitivity Sylvania Vacuum Tube

This is an original Sylvania 931A Photomultiplier tube. This tube has nine stages and a 1,000V anode supply. It has an S4 Spectral Response and a Luminous Sensitivity: 20 a/lm. Most of the 931A tubes were made by RCA or GE. This Sylvania tube is a rare, hard to find, classic collector's special eleven pin tube. This detector tube is useful in spectroscopy, astronomy, nuklear radiation detection, many older instruments and special measuring circuits. Excellent as a technical collectible, for instrument restoration projects or to set up a private vacuum tube museum. This is a NOS (New Old Stock) is unused, boxed, in excellent condition. One available. First come first serve.

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HISTORICAL TECHNICAL COLLECTIBLE Features: • 931A Photomultiplier Tube by Sylvania • Spectral Response: S4 Number of Stages: 9 • Wavelength Response Max: 4,000 ± 500 Angstroms • Current Amplification Ratio: 150,000 Anode/Cathode • Luminous Sensitivity - Cathode: 20 ua/lm • Anode Supply: 1,250 VDCmax • Base: 11-pin - Socket available for $5 • High quality Made in USA • Size: 1.31 Dia max x 3.69 max [in.] Notes: • NOS - New Old Stock tube in original box • Unused - Price: $60 - One available • S/H included within continental US

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