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20F2

 
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The 20F2 screened RF pentode was designed for use in universal (ie no mains transformer) sets with a series connected heater chain. Mostly in television receivers at RF or as a sync separator.
The thin glass tube envelope is 20 mm in diameter and, excluding the B8A base pins, is 52 mm tall.
References: Datasheet, 1040 & 3002. Type 20F2 was first introduced in 1949.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
11.0
0.2
135
135
-1.3
27
6.5
10.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 15, 2013.
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