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N30

Sensibly equivalent to:
7D5 PP13A
See also:
Catkin Valves - The Metal Valve
    
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The N30 is from the second series of M-OV Catkins and has an opaque enamelled top envelope.
The N30 was a version of the MPT4 with a 13 V 0.3 A heater, intended for use in AC/DC sets.
The visible envelope is in fact a precision shaped copper anode that is sealed to the lower glass envelope.
The large wide base hides a rubber sealing ring that helped to reduce microphonic effects.
The thin metal tube envelope is 18 mm in diameter and, excluding the B7 base pins, is 103 mm tall.
References: Datasheet. 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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