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20P4

Sensibly equivalent to:
CL30
See also:
Valves and their Habits
    
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The 20P4 is purpose designed as a television line output valve.
In September 1953 Mazda described the 20P4 as having a redesigned g2 with consequent reduction in screen dissipation and increase in power handling on positive pulses. The sensitivity of the valve has also been increased.
The valve can withstand a positive anode surge of 6 kV. The screen grid can dissipate 5 Watts.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 88 mm tall.
References: Datasheet & 1040. Type 20P4 was first introduced in 1953.

 

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

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Pdiss
38
0.2
400
250
10W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 30, 2013.
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