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The Type 18 is an audio output pentode. The anode dissipation is 11 Watts, the load impedance should be 7,000 Ω and the cathode bias resistor 410 Ω.
Under these conditions an audio power output of 3.2 Watts is to be expected.
The pinch and lower mica can be seen by looking up under the coating.
The dome with mica sheets tightly fitting the shoulder on the glass envelope. The control grid is fitted with heat dissipating fins.
The classic envelope is 44 mm in diameter, and excluding the UX6 base pins is 104 mm tall.
References: Datasheet & 1040. Type 18 was first introduced in 1937.

 

Pin Connections
UX6
1
2
3
4
5
6
h
a
g2
g1
k,g3
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
14.0
0.3
385
285
-20.0
38
7.0
80,000
2.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 09, 2018.
shape:classic construction:all.glass type:pentode age:1930.1940 base:ux6 heater:300ma pins:6 pin:1.h pin:2.a pin:3.g2 pin:4.g1 pin:5.k.g3 pin:6.h
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