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41MPG

Sensibly equivalent to:
15A2 A80A CV2505 CV3576 FC4 MH4105 MX40 V04 VHT4 X42
See also:
Pentagrid Converters
    
Extras ▼

 

The Cossor 41MPG is a 1934 heptode frequency changer.
The British radio industry was slow in adopting the superhet for a variety of reasons one of which was that British valve manufacturers were slow in developing the specialised types of valve required in an efficient, low-cost set. The American radio industry showed the way and the 41MPG is a UK copy of the American 'pentagrid converter.
The oscillator voltage was designed to be 10.0 V peak to peak.
The original top cap is missing and the wire that should connect to the metal paint has come adrift.
The classic envelope is 44 mm in diameter and, excluding the B7 base pins, is 108 mm tall.
References: Datasheet, 1040 & 1043. Type 41MPG 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
mAa
mAs
Vg
gm
4.0
1.0
250
80
1.0
3.0
-1.5
1.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December11, 2017.
shape:classic 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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