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9002

Sensibly equivalent to:
CV664
See also:
Acorn Antiques
    
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This 9002 has smudged red lettering but with care the Type designation can be read as can the fact that it was made in America.
The 9002 is a UHF receiving triode for use as a Class A amplifier. The electrode assembly is very small, of the same scale as an acorn valve. Indeed I believe that the 9002 is a repackaged 955 acorn valve.
B7G valves were make in the USA in the early 1940's but not made in the UK until 1947 or so.
The small electrode structure has both top and bottom micas and then a second top mica to fit the glass tube. This construction supports the belief that the 9002 is in fact a repackaged form of the 955 acorn.
A face view of the electrodes. The control grid is wound on copper supports.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 36 mm tall.
Reference: Datasheet. Type 9002 was first introduced in 1943.

 

Pin Connections
B7G
1
2
3
4
5
6
7
a
k
h
h
a
g1
k

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
6.3
0.15
250
-7
6.3
11.4k
2.2
25
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 20, 2014.
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