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CL4

 
    
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The CL4 audio output pentode was designed for singled use in universal mains receivers. The 4 Watt output was quite respectable.
The CL33 is electrically identical but has the more successful IO base. Whereas the pen36c is engineered on an British B7 base.
The classic envelope is 41 mm in diameter and, excluding the Ct8 base contacts is 120 mm tall.
References: Datasheet & 1040. Type CL4 was first introduced in 1938.

 

Pin Connections
Ct8
1
2
3
4
5
6
7
8
-
h
h
k
-
-
g2
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
33
0.2
200
200
-5.5
45
6
35,000
8.0
4W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December31, 2012.
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