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VR40Sensibly equivalent¶ to:See also:
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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: Data-sheet, 1040 & 1043. |
Pin Connections
| 1 | 2 | 3 | 4 |  a | g1 | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | Pdiss | D | 
| 4.0 | 2.0 | 500 | -54 | 82 | 26 | 4% |
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Updated April 03, 2015.
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