Lot of 2 pcs. GI401B (ГИ401Б) or GI404B (ГИ404Б) or GI404A ( ГИ404А ) 

GOLD Plated ! Military Germanium Tunnel Diodes, Microwave UHF

USSR Military Switching Tunnel Germanium Diode Backward

In metal-ceramic case, GOLD Plated!

New, old stock

GI401B or GI404B germanium inverted diode, mesa-alloy. Intended for use in detectors, mixers, and pulsed devices.