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B729

Sensibly equivalent to:
6/30L2 6GA8 ECC804
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Valves and their Habits
    
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The B729 is a pair of separate amplifier triodes within the same envelope. The two sections are separated by a metal screen.
The B729 was developed for domestic television receivers and the heater has controlled conditions such that it can be used for parallel operation on a constant 6.3 Volt supply or within a 300 mA series heater chain.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 47 mm tall.
References: Datasheet & 1040. Type B729 was first introduced in 1958.

 

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)
s

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
200
-7.9
10.0
5.3k
3.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 14, 2013.
shape:thin.glass.tube construction:all.glass type:double.triode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.a(2) pin:2.g1(2) pin:3.k(2) pin:4.h pin:5.h pin:6.a(1) pin:7.g1(1) pin:8.k(1) pin:9.s
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