Tube: SI-14B (CИ-14Б) Pancake Geiger Muller Posted by By Radu Motisan July 12, 2010 The Russian SI-14B is a highly sensitive pancake geiger muller tube .
CdS Photosensitive Vacuum tubes Posted by By Radu Motisan October 28, 2009 A collection of a few NOS photosensitive vacuum tubes.
