▼ Menu

VMS4

Sensibly equivalent to:
AC/SGVM AS4125 CV1165 MVSPen VP4
See also:
Some Important British Valves - M-OV's Screened Grid Valves
    
Extras ▼

 

The Catkin version of the VMS4 variable μ screened tetrode dates from 1934. It was designed for RF and IF amplification in broadcast superhet receivers.
The screw top cap. Looking into the valve one can see that the actual copper anode is of much smaller diameter than the outer screening can.
This M-OV valve carries the consumer Osram label.
The wide metal tube envelope is 34 mm in diameter and, excluding the B5 base pins, is 107 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
gm
4.0
1.0
200
80
-0.5-30.0
10.0
2.1
2.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 16, 2013.
Return to Main Index