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VR65

Sensibly equivalent to:
10E/11446 ARP36 CV118 CV1065 SP61
See also:
CV1065 short entry
    
Extras ▼

 

The VR65 ia a WWII military receiving pentode valve made for the RAF. The VR in the designation provides this information, additionally this valve carries the old stores code of 10E/11446.
Commercially this is an SP61 that was developed originally for television RF stages. The SP41 is the same electrically but has the pre-war 4.0 Volt standard heater. The maker has to be Mazda as the base is the Mazda Octal sometimes called the British Octal. It was a rival to the International Octal and lost the battle.
With the grid at the top cap, this is the normal pattern for RF and IF amplifier valves of the period. Providing high gain in tuned anode circuit applications. For additional screening the valve is covered with an external metalisation.
The VR65 was used in air-borne radar particularly GEE.
The reverse is plain.
The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 82 mm tall.
References: Datasheet & 1043. Type VR65 was first introduced in 1941.

 

Pin Connections
MO
1
2
3
4
5
6
7
8
tc
h
k
a
g2
g3
m
nc
h
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.6
200
200
-1.5
10.9
2.7
0.7M
8.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 13, 2017.
shape:classic construction:pinch type:pentode age:1940.1950 base:mo heater:6.3v pins:8 pin:1.h pin:2.k pin:3.a pin:4.g2 pin:5.g3 pin:6.m pin:7.nc pin:8.h pin:tc.g1
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