G19557 - Sensitive Giant Russian Geiger Tube (SBM-19/STS-6)
This super sensitive metal tube SBM-19/STS-6 was made in Russia during the cold war. It is about 7.6" long x 0.71" diameter (including terminals). Operates on 350VDC - 475VDC and detects beta and gamma rays. Here in Arizona it produces a background count of over 100cpm. New old-stock GM tube. Note: May have discoloration or tarnish on outer metal due to its age. Note: Some of the tubes may have a slight mechanical rattle when you shake them, however it will not affect performance in any way. All are fully tested before shipping!