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N30

Sensibly equivalent to:
7D5 PP13A
See also:
In the Beginning - Osram - Catkin Valves - The Metal Valve
    
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This N30 carries the Osram badge, it is a Catkin external anode audio output valve. All Catkins were made by M-OV.
It was designed to be used as the audio output stage of an all-mains receiver. The design is dated to 1934 and is a series 2 Catkin. The N30 was a version of the MPT4 but with a 13 Volt 0.3 Amp heater for use in AC/DC sets without mains transformers.
The thin metal tube envelope is 18 mm in diameter, with the metal base 28 mm in diameter and, excluding the B7 base pins, is 103 mm tall.
References: Datasheet & 1005. Type N30 was first introduced in 1934.

 

Pin Connections
B7
1
2
3
4
5
6
7
-
g1
g2
h
h
k
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
13.0
0.3
250
250
-15
32
8
3.9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December13, 2012.
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