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14K7

Sensibly equivalent to:
141TH UCH42 X142
    
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The 14K7 is an all glass triode hexode from 1949 and was designed as oscillator and mixer for superhet receivers. The hexode has a variable μ characteristic so that its gain can be controlled from the AGC line.
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.
Originally B8A based valves had metal skirts with a pressed out locating pip. This is a later type produced with a moulded glass skirt and integral locating pip.
The thin glass tube envelope is 20 mm in diameter and, excluding the B8A base pins, is 54 mm tall.
References: Datasheet & 1040.

 

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 March 22, 2014.
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