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3B4

Sensibly equivalent to:
CV2240 DL98 HD30
See also:
Hytron 3B4 Box
    
Extras ▼

 

The 3B4 is a miniature RF output pentode designed for Class C operation up to 100 MHz. It is described as directly heated with instant warm-up for use in portable equipment where saving battery life is important.
The stitched anode.
The additional screens can be seen above the top mica and below the lower mica.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
Reference: Data-sheet. Type 3B4 was first introduced in 1948.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g2
fct,bp,s
g1
f
f
fct,bp,s
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
1.25
0.33
150
135
-39
25.0
6.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 13, 2020.
shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b7g pins:7 pin:1.g2 pin:2.fct.bp.s pin:3.g1 pin:4.f pin:5.f pin:6.fct.bp.s pin:7.a
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