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6C4

Sensibly equivalent to:
CV133 CV852 EC90 L77 V741
    
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The 6C4 triode was specified as both an amplifier and an RF power valve. In the latter role it would deliver 5.5 Watts. With a very small envelope volume, this would make it ideal for hand portable equipment. In larger apparatus it could deliver enough drive power for much larger PA's.
The Brimar data-sheet says the curves match half of the 12AU7 but the anode current can be twice the value at 25 mA in Class C service.
The thin glass tube envelope is 18 mm in diameter and has an overall length, excluding the B7G base pins, of 45 mm.
References: Datasheet & 1040.

 

Pin Connections
B7G
1
2
3
4
5
6
7
a
k
h
h
a
g1
k

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
mAa
gm
Pdriv
Pout
Pdiss
freq
f.max
6.3
0.15
250
10.5
2.2
0.35W
5.5W
5W
70
150
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 26, 2013.
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