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RCA 1P21 circular cage-style 9-stage photomultiplier tube, humidity-stable beige base, used, untested, 1 piece. Like other circular cage PMT's, the 1P21 is a descendant of the original RCA 931. The 1P21 has a S-4 spectral response, with a peak response at 380 nm. Cesium-antimony photocathode and dynode emitting surfaces, lime glass window.
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