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ARP26

Sensibly equivalent to:
CV1340 CV1577 KT44 VT75B
    
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The ARP in the ARP26 indicates a UK Army receiving pentode. This valve was renamed CV1340 when the Common Valve register was introduced in 1941. The prototype was the M-OV KT44 Beam tetrode.
The open end of the anode reveals the two wire grids and the bright beam plates.
The main heat is generated in the centre of the anode and this is where the heat sinking flanges are located. Note the ceramic insulators.
A closer view. The control grid is wound on copper supports. The grids are aligned and pass flat across the cathode.
The grid wires are secured in the supports by normal the notch and peen method.
The classic envelope is 56 mm in diameter, and excluding the B7 base pins is 131 mm tall.
Reference: Datasheet.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
-
g1
s
h
h
k
g2
a

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
Pout
D
4.0
2.0
400
300
-25
85
20
6.3
7.5
9%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 08, 2019.
shape:classic construction:pinch type:beam.tetrode age:1930.1940 base:b7 heater:4.0v pins:7 pin:1.- pin:2.g1 pin:3.s pin:4.h pin:5.h pin:6.k pin:7.g2 pin:tc.a
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