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AC/VP1

Sensibly equivalent to:
9A1 A50M CV518 HP4106C MVSPen VMP4G VP4A VP4 VPT4B
See also:
Murphy Radio
    
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The AC/VP1 is a variable μ screened pentode designed for mains radio receivers. The variable μ characteristic enables automatic gain control of RF and IF amplifiers in superhet receivers.
The AC/VP1 and AC/VP2 were the standard RF/IF screened pentodes in the Mazda range for AC mains radios from the mid-1930s until domestic radio manufacture was interrupted by WWII.
The two valve types were essentially identical except that the AC/VP1 has its anode connected to the top cap, as with most screen-grid valves. The AC/VP2 has the control grid (g1) connected to the top cap, as was standard for later IF pentodes.
The B7 version was introduced in 1939 and this, the B5 based version, is earlier.
The reverse is plain.
The classic envelope is 39 mm in diameter and, excluding the B5 base pins, is 107 mm tall.
Reference: Datasheet. Type AC/VP1 was first introduced in 1934.

 

Pin Connections
B5
1
2
3
4
5
tc
g2
g1
h
h
k
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
4.0
0.65
250
250
-2.8
7.4
1.85
1M
2.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 21, 2016.
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