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CV9994

Sensibly equivalent to:
ZA9
    
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The CV9994 (commercially the ZA9) is a beam tetrode with a 10 Watt anode dissipation and a 200 mA heater for series chain use. The 5B/104D is equivalent.
The KB/FE identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the FE identifies the maker as STC, Oldway (Additional to Paignton factory 'F').
This valve was made in England by STC but carries the parent company's identification of ITT.
Looking into the top a copper grid support and two heater folds are seen.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 70 mm tall.
References: Data-sheet.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
nc
h
a
g2
g1
nc
h
k,bp

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
μ
24
0.2
200
110
-
50
-
3.0
4.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 20, 2025.
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