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CV3998

Sensibly equivalent to:
5A/170K 6688 E180F
See also:
Nuvistor Valves
    
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The CV3998 is a high-slope RF beam tetrode primarily intended for use in wideband amplifiers in telephone carrier systems, radar equipment and measuring equipment. The CV specification shows that the Government requirement was for the GPO telephone system. The prototypes were the 5A/170K from STC and the E180F from Mullard.
This very small size helps to reduce inter electrode capacitance and thereby raises the maximum usable frequency that the device can operate at.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 33 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
k
g1
k
h
h
k
a
g3,s
g2

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
190
160
-1
13
3.3
35K
16.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 14, 2013.
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