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CV4006

Sensibly equivalent to:
6059 CV2135 VX7081
    
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The CV4006 is the UK government procurement specification for the commercial 6059 which is itself a special quality version of the type 6BR7. The specification gives the prototype as the VX7081. The valve was carefully designed for low internal noise and, especially, for low internal hum pick-up from the 6.3V AC heater, thus making it unnecessary to provide a DC source of heater current.
Haltron is the brand name of Hall Electric and their valves were for export from the UK.
The view along the grids, the grids themselves are obscured.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 47 mm tall.
References: Datasheet & 1040.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.15
250
100
-3
2.1
0.6
2.3M
1.25
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 12, 2013.
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