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SP61

Sensibly equivalent to:
ARP36 CV118 CV260 CV1065 VR65
See also:
Valves and their Habits - SP61 SP41 P61 & P41 Advert - A Magnetic Digital Storage System
    
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The SP61 was a commercial television RF pentode that became adopted by the military during WWII. We have several variants in the collection, but this is the original livery of the manufacturers and is covered by an external screening metalisation. For mixer use a separate low noise oscillator was designed this was the P61 also known as the VR66.
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.
The rear of the envelope is just plain zinc paint.
The classic envelope is 33 mm in diameter and, excluding the MO (Mazda Octal) base pins, is 82 mm tall.
References: Datasheet, 1043 & 1040. Type SP61 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 24, 2015.
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