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CV797

Sensibly equivalent to:
20A3 2D21 4G/280K 5757 CV4018 E1955 EN91
See also:
Mufax Chart Recorder Maintenance Manual - Gas Clean-up in Xenon Thyratrons
    
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The CV797 is a xenon filled tetrode thyratron. The prototype was the commercial 2D21.
The rectangular box is grid two. The anode connection is in a ceramic tube from the base pin up and into the box.
The STC logo and commercial Type code 2D21 indicating equivalence.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 43 mm tall.
Reference: Data-sheet. Type CV797 was first introduced in 1944.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
k
h
h
g2
a
g2

 

Absolute Maximum Operating Conditions
General Notes
Vh
Ah
Va
mAa
6.3
0.6
650
500
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 26, 2020.
shape:thin.glass.tube construction:all.glass type:thyratron age:1950.1960 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.k pin:3.h pin:4.h pin:5.g2 pin:6.a pin:7.g2
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