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6/30L2

Sensibly equivalent to:
6GA8 B729 ECC804
See also:
Valves and their Habits - Locked-Seam Cathodes
    
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The reseller Zaerix has both the Mazda 6/30L2 Type designation and the Mullard ECC804 on the envelope.
The design is a general purpose double triode with a screen between the sections. The main application is in television receivers.
The ECC804 Type designation.
Both triodes have stitched anodes and copper grid supports. The heater wire has been coiled prior to applying the insulation.
The triodes are side by side with the screen shaped for maximum isolation.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 48 mm tall.
References: Data-sheet & 1040 Type 6/30L2 was first introduced in 1958. See also 1958 adverts.

 

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
-7.7
10.0
5.3k
3.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 10, 2026.
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