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VGT121

Sensibly equivalent to:
CV1121 T41
See also:
CV1121 short entry
    
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The VGT121 is a thyratron. The T41 from Mazda is equivalent and only Mazda used the MO (Mazda Octal or British Octal) base.
The thyratron is a special gas filled valve that at a given grid voltage rapidly moves into full conduction, when the gas ionises, thus acting as a switch. Under the correct circuit conditions this action can be made to generate ramps or pulses.
These valves were used in early radar and television as ramp generators, and in the first computers as pulse generators.
The reverse is plain zinc loaded screening paint.
The classic envelope is 32 mm in diameter, and excluding the MO base pins is 73 mm tall.
References: Data-sheet, 1040 & 1043. Type VGT121 was first introduced in 1940. See also 1940 adverts.

 

Pin Connections
MO
1
2
3
4
5
6
7
8
h
k
a
nc
g1
m
nc
h

 

Absolute Maximum Operating Conditions
The Thyratron
Vh
Ah
Va
mAa
f.max
4.0
1.5
400
500
0.02
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 10, 2019.
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