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X143

Sensibly equivalent to:
ECH21
    
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The X143 is an all glass triode heptode frequency changer for radio reception. The central locating spigot is also the connection for the cathode, grid 5 and the internal mesh screen.
The oscillator triode was designed to produce 14 Volts peak to peak feed for the mixer section. The heptode portion is vari-μ.
The screen obscures the electrodes.
The base with central locating spigot acting as pin 9.
The wide glass tube envelope is 28 mm in diameter and, excluding the B8B base pins, is 62 mm tall.
Reference: Datasheet & 3002. Type X143 was first introduced in 1949.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
h
a
a(t)
g1(t)
g2,g4
g1
g3
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
mAa
6.3
0.33
160
4.5

 

Absolute Maximum Operating Conditions
Hexode
Va
Vs
Vg
mAa
mAs
ra
gm
250
100
-2
3.0
6.2
1.4M
0.75
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 03, 2013.
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