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A1714

Sensibly equivalent to:
CV408
See also:
Planar Electrode Valves for VHF - GEC Low Noise Valves Advert
    
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The A1714 is a planar triode designed for high frequency use.
The main use was probably VHF television at 45 MHz, which is the same as WWII Radar IF frequencies.
The anode dissipation is 2.5 Watts and running an RF amplifier at a moderate current was a way to keep the noise low and the A1714 had a noise equivalent resistance of 550 Ohms. At 45 MHz the input resistance was given as 40,000 Ohms. The maximum anode voltage was 250 Volts.
The Osram brand label indicates a consumer product.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
References: Datasheet.

 

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

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
gm
6.3
0.5
150
-1
10.0
9.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 15, 2019.
shape:thin.glass.tube construction:all.glass type:triode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.k pin:3.h pin:4.h pin:5.- pin:6.ic pin:7.a
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