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CL4

 
    
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The CL4 audio output pentode was designed for single ended 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 side of the anode.
The three grid supports and additional vertical supports.
The cathode tube is a rectangle with rounded sides.
The classic envelope is 44 mm in diameter and, excluding the Ct8 base contacts is 123 mm tall.
References: Datasheet & 1040. Type CL4 was first introduced in 1938.

 

Pin Connections
Ct8
1
2
3
4
5
6
7
8
tc
-
h
h
k,g3
-
-
g2
a
g1

 

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 March 03, 2018.
shape:classic construction:pinch type:pentode age:1930.1940 base:ct8 heater:200ma pins:8 pin:1.- pin:2.h pin:3.h pin:4.k.g3 pin:5.- pin:6.- pin:7.g2 pin:8.a pin:tc.g1
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