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Z14

Sensibly equivalent to:
1N5GT 1N5G DF33
See also:
Osram Valve Range Advert
    
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The Z14 is a variable μ RF pentode for dry battery operation used for domestic broadcast receivers at RF or as an IF amplifier. The filaments had to have the lowest possible consumption due to the cost of the dry batteries.
The Osram paper label.
The pinch construction places all connections in line. The outer perforated screen has shaped mica sheets that hold the assembly firm within the envelope.
The filament tensioning spring can be seen on the left. At the base is a screening disc.
The wide glass tube envelope is 28 mm diameter, and excluding the IO base pins, is 81 mm tall.
References: Data-sheet, 1040 & 1043. Type Z14 was first introduced in 1940.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
f+
a
g2
-
-
f-
-
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.4
0.05
90
90
0
1.2
0.3
1.5M
0.75
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 18, 2021.
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