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VMS4B

Sensibly equivalent to:
AC/SGVM AS4125 CV1165 MVSPen VP4
See also:
Some Important British Valves - M-OV's Screened Grid Valves
    
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The VMS4B variable μ screened tetrode. It was designed for RF and IF amplification in broadcast superhet receivers and was superseeded by the Pentode and KT valves.
The envelope shape matches Mazda production rather than M-OV and so this was probably not made by M-OV.
See also VMS4 for the earlier 1931 version.
The classic envelope is 37 mm in diameter and, excluding the B5 base pins, is 103 mm tall.
References: 1005 Type VMS4B was first introduced in 1933.

 

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
8.0
1.5
0.45M
2.9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 07, 2015.
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