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B309

Sensibly equivalent to:
12AT7 CV455 E2151 ECC81
See also:
Osram B309, N309, LN309, U329 & 6901A Advert
    
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The M-OV B309 is labelled as MWT (Marconi's Wireless Telegraphy) and was sold for professional communications systems. It is a double triode equivalent to the Mullard ECC81. The device was designed for RF use and is of the low impedance type first adverts are from 1953.
The thin glass tube envelope is 20 mm in diameter and excluding B9A base pins the length is 48 mm.
References: Datasheet & 1040. Type B309 was first introduced in 1953.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a(2)
g1(2)
k(2)
h
h
a(1)
g1(1)
k(1)
hct

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.6
250
2.0
10.0
10,000
5.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 07, 2013.
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