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K30K

Sensibly equivalent to:
PM2HL
    
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The Ever Ready K30K is a directly heated triode and identical to the Mullard PM2HL - Mullard being the actual manufacturer. This example of the balloon enveloped version is metalised whereas K30K has a plain glass bulb.
The identification is printed on to the dome.
The balloon envelope is 41 mm in diameter and, excluding the B4 base pins, is 79 mm tall.
References: Datasheet & 1043. Type K30K was first introduced in 1937.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
2.0
0.1
135
-1.5
2.2
21,500
1.4
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated January 09, 2017.
shape:balloon construction:pinch type:triode age:1930.1940 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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