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33

Sensibly equivalent to:
VT-33
    
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The Type 33 is an audio output pentode. It is a battery valve with an output of 1.4 Watts maximum. The anode load impedance is given as 6,000Ω.
This exhibit is marked as Special Export Tested.
The filament is a single inverted V. The outer grids are wire wound.
The base pins
Thanks to Mark Mallison for sending the images.
The classic envelope is  mm in diameter and, excluding the UY base pins, is  mm tall.
Reference: Datasheet. Type 33 was first introduced in 1936.

 

Pin Connections
UY
1
2
3
4
5
f+
a
g1
g2
f-

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
μ
2.2V
0.26
180
180
-18
22
5.0
55,000
1.7
90
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 13, 2019.
shape:classic construction:pinch type:pentode age:1930.1940 base:uy heater:6.3v pins:8 pin:1.f+ pin:2.a pin:3.g1 pin:4.g2 pin:5.f-
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