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VT-202

Sensibly equivalent to:
9002
See also:
Acorn Antiques
    
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VT-202 is the American government procurement code for the 9002 UHF triode. This receiving valve carries both the 9002 and VT-202 codes and was designed for use as a Class A amplifier.
The electrode assembly is very small, the same scale as an acorn valve. Indeed the 9002 is a repackaged 955 acorn valve but without the problems associated with the acorn assembly and tendency for the envelope to crack as the valve's horizontal pins were pushed into the base.
The broad face of the anode. The control grid is wound on copper supports and the grid winding extends outside the active anode area.
The electrodes are at an angle as the mica sheets do not reach to the glass. They are probably cut for the acorn envelope.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 38 mm tall.
Reference: Datasheet. Type VT-202 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 January 03, 2015.
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