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X41

Sensibly equivalent to:
20A1 CV1194 CV1460 NR84
See also:
Some Important British Valves
    
Extras ▼

 

The X41 is a metalised triode hexode frequency changer designed for AC mains receivers. The X31 was designed with a heater for universal mains (AC/DC sets) but is otherwise identical.
The interesting feature of this exhibit is the zinc paint. It is still in one piece but has become detached from the glass and has expanded away from the glass in places.
The Osram brand name.
The top of the valve with the metal paint standing away from the glass that it was originally sprayed on to.
The classic envelope is 48 mm in diameter and, excluding the B7 base pins, is 113 mm tall.
References: Datasheet & 1043. Type X41 was first introduced in 1935.

 

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

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
gm
4.0
1.2
250
80
-1.5
0.55

 

Absolute Maximum Operating Conditions
Triode
Va
150
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 15, 2018.
shape:classic construction:pinch type:triode.hexode age:1930.1940 base:b7 heater:4.0v pins:7 pin:1.a(t) pin:2.g1(t).g3 pin:3.g2.g4 pin:4.h pin:5.h pin:6.m.k pin:7.a pin:tc.g1
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