▼ Menu

VMP4/K

Sensibly equivalent to:
VMP4
See also:
Catkin Valves - The Metal Valve
    
Extras ▼

 

The VMP4/k or VMP4 is a variable μ screened amplifier pentode for RF and IF amplification in superhet receivers. This exhibit is the Catkin version and internally is totally different to the glass replacement the VMP4G.
This M-OV valve is branded Marconi by the paper label.
The outer screen is closed with a locked seam.
The original top cap was of the screw type. Here the later top-hat top cap is used but the top is threaded to allow it to be used in sets designed for the older connection method.
The envelope is 38 mm in diameter and, excluding the B7 base pins, is 113 mm tall.
References: Data-sheet & 1043. Type VMP4/K was first introduced in 1934.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
m
g1
g3
h
h
k
g2
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
4.0
1.0
250
100
-2.0
8.0
5.0
2.7
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 16, 2021.
Return to Main Index