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6CK5

Sensibly equivalent to:
67PT CV3889 EL41 N150
    
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The 6CK5 is an early design for an all glass output pentode rated for 9 watts anode dissipation, and intended primarily for use in AC mains operated equipment and to be used with self-bias or semi-automatic bias only.
The 6CK5 is identical to the EL41.
This valve has a wider base to the envelope and a locating pip moulded into the glass.
The thin glass tube envelope is 21 mm in diameter and, excluding the B8A base pins, is 68 mm tall.
References: Datasheet & 1040. Type 6CK5 was first introduced in 1947.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a
k
k,g3
g2
g1
k
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pdiss
Pout
D
6.3
0.7
250
250
-7
36
5.2
40,000
10
9W
4.2W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 12, 2013.
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