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K30G

Sensibly equivalent to:
PM2A
See also:
The Azide Process
    
Extras ▼

 

Ever Ready are known as makers of dry batteries and at one time they made some valves. Later a deal with Mullard allowed Ever Ready to sell their own brand of valves that were made by Mullard. The K30G is in fact a Mullard PM2A.
This audio valve could drive a small loudspeaker it had an output rating of 0.15 Watt at 5% distortion.
The brand identification and Type designation are etched into the top of the glass.
The electrode assembly is mounted horizontally and the oxide coating on the filament looks to have been formed by the Azide process as the inside of the glass is blackened.
The balloon envelope is 46 mm in diameter and, excluding the B4 base pins, is 92 mm tall.
References: 1931 datasheet & 1043. Type K30G was first introduced in 1935.

 

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
0.2
135
-6
5.0
6,000
2.0
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated October 09, 2019.
shape:balloon construction:pinch type:triode age:1920.1930 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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