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W30

Sensibly equivalent to:
VPTS W31
See also:
Catkin Valves - The Metal Valve - Osram W30 Box
    
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The W30 is a series two catkin from 1934 and is a 300 mA version of the VMP4. The internal envelope shape is similar to the N30 but the W30 has a substantial outer screening can rigidly attached.
The valve is a variable μ pentode and was used for broadcast radio reception. The 300 mA heater specification was introduced for series heater chains and, therefore, transformerless designs for 'Universal' AC/DC mains sets.
W31 is pin compatible but has a slightly lower specification.
The Osram Catkin label.
The wide metal tube envelope is 38 mm in diameter and, excluding the B7 base pins, is 114 mm tall.
References: Datasheet & 1040 Type W30 was first introduced in 1934.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
m
g1
g3
h
h
k
g2
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
13.0
0.3
250
250
-1
12
6
1M
4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December17, 2011.
shape:catkin construction:pinch type:pentode age:1930.1940 base:b7 heater:300ma pins:7 pin:1.m pin:2.g1 pin:3.g3 pin:4.h pin:5.h pin:6.k pin:7.g2 pin:tc.a
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