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VR40

Sensibly equivalent to:
10E/9601 CV1040 DO24 NR47 PX25
See also:
CV1040 short entry
    
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The VR40 is the PX25 (PP5/400) in military uniform.
This early audio power triode was one of the first to give a significant output. Five Watts single ended and up to 20 Watts in push pull. With the loudspeakers of the time this was suitable to fill a small hall. With transformers of the period being less efficient than later designs an audio power amplifier using a pair of these valves was a substantial piece of equipment, and heavy.
The ratings given are for class AB1 push pull for a pair of such valves. Under these conditions the grids would require 108 Volts peak to peak to achieve full output.
The balloon envelope has a maximum diameter of 60 mm and excluding the B4 base pins it is 133 mm tall.
References: Datasheet, 1040 & 1043.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
Pdiss
D
4.0
2.0
500
-54
82
26
4%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 03, 2015.
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