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N309

Sensibly equivalent to:
N153 PL83
See also:
Osram B309, N309, LN309, U329 & 6901A Advert
    
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The N309 was designed as a sensitive video output valve for television receivers and was released in 1953. It is the equivalent to the Mullard PL83.
The N153 is very similar but has a higher ra value.
The valve is also rated for service as an audio output device. With 68 Ohms in the cathode lead to generate grid bias, and a load impedance of 5000 Ohms the N309 will give 1.65 Watts at 7.8% total distortion. With the high gm value it will need little drive.
The Marconi label is a brand name of the M-OV company.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins, is 68 mm tall.
References: Datasheet & 1040. Type N309 was first introduced in 1953.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g2
g1
k
h
h
g3
a
s
-

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAs
ra
gm
15
0.3
170
170
-2.5,mAa_32.0
4.2
41000M
10.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 29, 2013.
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