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X142

Sensibly equivalent to:
141TH 14K7 UCH42
    
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The X142 is an early all glass triode hexode from 1948 and was designed as oscillator and mixer for superhet receivers, and the hexode section was designed to operate with an AGC control voltage. The 100 mA heater was intended for universal (AC/DC) sets, and this explains the low anode voltages.
The triode oscillator had to supply a peak to peak insertion voltage of 13 Volts.
Thanks to Mark Mallison for sending the image.
The thin glass tube envelope is  mm in diameter and, excluding the B8A base pins, is  mm tall.
References: Data-sheet, Data & 1040. Type X142 was first introduced in 1950. See also 1950 adverts.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a
a(t)
g(t),g3
g2,g4
g1
k
h

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
14
0.1
200
85
-2
3
3
1M
0.75

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
100
3.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 26, 2023.
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