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MX40

Sensibly equivalent to:
15A2 41MPG A80 A80A CV3576 FC4 FCH MH4105 VHT4 X42
See also:
Pentagrid Converters
    
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The MX40 is an 1934 heptode frequency changer or mixer. This example has the grey zinc paint metalising. The oscillator voltage was designed to be 10.0 V peak to peak.
The zinc paint carries the Marconi branding.
The balloon envelope is 44 mm in diameter and, excluding the B5 base pins, is 112 mm tall.
References: Datasheet, 1040 & 1043. Type MX40 was first introduced in 1934.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
g2
g1
g3,g5
h
h
m,k
a
g4

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
gm
4.0
1.0
250
80
-3
0.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December27, 2014.
shape:balloon construction:pinch type:heptode age:1930.1940 base:b7 heater:4.0v pins:7 pin:1.g2 pin:2.g1 pin:3.g3.g5 pin:4.h pin:5.h pin:6.m.k pin:7.a pin:tc.g4
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