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VMS4

Sensibly equivalent to:
AC/SGVM AS4125 CV1165 MVSPen VP4
See also:
Some Important British Valves - M-OV's Screened Grid Valves - 1931: The New Mains Valves
    
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The VMS4 variable μ screened tetrode dates from 1931. It was designed for RF and IF amplification in broadcast superhet receivers.
This exhibit has the screw top cap assembly. The screw top cap was phased out around 1933-4 and so this is an early version of the design.
The circular skirt near the base connects to the mesh screen grid.
The screw top cap. It looks as if the Bakelite covering the top nut has been lost.
The balloon envelope is 45 mm in diameter and, excluding the B5 base pins, is 125 mm tall.
References: Datasheet & 1005 Type VMS4 was first introduced in 1931.

 

Pin Connections
B5
1
2
3
4
5
tc
g2
g1
h
h
k
a

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
4.0
1.0
200
80
0.0
14.0
3.0
0.45M
2.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 18, 2018.
shape:balloon construction:pinch type:tetrode age:1930.1940 base:b5 heater:4.0v pins:5 pin:1.g2 pin:2.g1 pin:3.h pin:4.h pin:5.k pin:tc.a
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