A spotter's guide to the SBM-20 Geiger counter tube | MightyOhm
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DIY Geiger Counter Circuit
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Tube: SBM-20 (СБМ-20) Geiger tube – PocketMagic
Tubes Geiger-Müller type SBM-20, STS-5 et BOI-33 ( et SMB20-U / SMB20-1 )
GSTube.com''. Tubes, sockets etc. Parameters and characteristics SBM-20
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Tube: SBM-20 (СБМ-20) Geiger tube – PocketMagic
