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ID = 39709
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: Bell Labs; Murray Hill, NJ. 
Tube type:  MICROWAVE AND RADAR, general 
Identical to 1B42 = D-170135
First Source (s)
15.Dec.1947 : Tube Lore (I)

Was used by Radar

Series spark gap intended for high-power radar modulator circuits. Cathode is formed by mercury immobilized by a cup-shaped iron sponge, anode is a 0.06" diameter molybdenum rod.

Mercury evaporates due to the sparks, then condenses and returns into the iron sponge, so to always have fresh mercury film over the cathode surface. Hydrogen filling to minimize the jitter

80 to 300 A pulses, 5 kV breakdown voltage.

Introduced by WE during WWII as D-170135. RMA registration in 1947. Also manufactured by Machlett.

Dimensions (WHD)
incl. pins / tip
76 x 152 x mm / 2.99 x 5.98 x inch
Information source Tube Lore (I)   
-- Original-techn. papers.   Glasoe & Lebaqz, Pulse Generators

1B42: Manufacturer's Literature
Emilio Ciardiello

Collection of



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