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ATP35

Sensibly equivalent to:
CV1370 NT74 PV1-35
    
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The ATP35 is a pre-CV UK army transmitting pentode. After 1941, when the CV system started, it was renamed the CV1370.
The maximum anode dissipation is 35 Watts. The anode connection to the top cap is missing in this example.
There is a screen below the lower mica that extends over the pinch.
The anode is essentially oval with four flanges extending from it for fixing and cooling.
It is a true pentode with three wire grids. The cathode tube is wide but comes to a small diameter tube at the top where it is held by the top mica.
The lower screen.
The wide glass tube envelope is 52 mm in diameter, and excluding the B7 base pins is 139 mm tall.
Reference: Datasheet.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
g1
-
g3
h
h
g2
k
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
12.0
0.9
1,000
500
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 12, 2014.
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