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B309

Sensibly equivalent to:
12AT7 CV455 E2151 ECC81
See also:
Pin Compatible Double Triodes - Osram B309, N309, LN309, U329 & 6901A Advert
    
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The B309 is an RF double triode for television service and a special quality version was also made. (QA2406). The B309 was advertised as a new design in 1953.
The valve is equivalent to the Mullard ECC81.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 49 mm tall.
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)
h(tap)

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
250
-2.0
10.0
10000
5.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 07, 2013.
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