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VT51

Sensibly equivalent to:
220PT CV1051 Pen220A
    
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The VT51 battery audio output pentode was capable of 1.1 Watts at 7% distortion. The prototype was the Mazda Type Pen220A.
With the advent of the CV register in 1941 the VT (RAF Valve Transmitting) 51 became the CV1051. This exhibit also carries the old stores code of 10E/10946.
The bright box anode and above the top mica can be seen the two filament tension springs.
The top of the valve with layers of mica supports. the top support holds the filament tension springs.
The classic envelope is 38 mm in diameter and, excluding the B5 base pins, is 92 mm tall.
References: Datasheet & 1043. Type VT51 was first introduced in 1933.

 

Pin Connections
B5
1
2
3
4
5
a
g1
f-
f+
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.2
150
150
-9
18
3.6
270k
2.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 28, 2014.
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