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ID = 47697
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Thyratron 
Identical to 3D22A
Similar Tubes
Normally replaceable-slightly different:

Base 7-Pin-Base U7G = Giant, old, USA
Filament Vf 2.6 Volts / If 6.3 Ampere / Indirect / Parallel, (AC/DC)
Description Gas thyratron tetrode, short T16 bulb, giant 7 pin base. 1350V PIV, 750mA.
National Electronics and RCA known manufacturers. 
3D22A: Patrice ZEISSLOFF
Patrice Zeissloff


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