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VR109

Sensibly equivalent to:
4D1 AR7 CV1000 CV1109 HL1320 NR55
    
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The CV1109 is a triode known formerly as the NR55, AR7 and the VR109. This exhibit was made for the RAF before 1941 and has the designation of VR109.
The prototype was the 4D1.
The crown and AM of the Air Ministry.
NAPL has to be a depot or test area. The triode stands above the pinch and the control grid connects to the top cap
The heater can be seen to pass multiple times through the cathode tube. The internal working part of the anode is cylindrical.
Although the envelope is shouldered to allow for an interference fit of the top mica, here the top mica does not make contact with the glass. All the support is from the pinch.
The classic envelope is 38 mm in diameter and, excluding the B7 base pins, is 97 mm tall.
Reference: Data-sheet. Type VR109 was first introduced in 1934.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
-
-
-
h
h
k
a
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
13.0
0.2
250
-3
-
10,000
4.0
40
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 18, 2021.
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