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VR91Sensibly equivalent¶ to:See also:
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The WWII EF50 in a plain aluminium screening can and carrying the UK Air Ministry branding. The VR91 is Valve Receiving number 91.This amplifier pentode was a general workhorse. It was extensively used in radio and radar during WWII.The pins are equi-spaced around the circumference of the pin circle.The lettering on this example does not have the Air Ministry initials and crown of our other Rogers VR91.
The Rogers Company information and Made in Canada.The wide glass tube envelope is 34 mm in diameter and, excluding the B9G base pins, is 60 mm tall.References: 1040. Type VR91 was first introduced in 1938. See also 1938 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  h | g2 | a | g3 | s | k | g1 | s | h |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | 
| 6.3 | 0.3 | 250 | 250 | -2 | 10 | 3 | 1.0M | 6.5 |
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Updated February 17, 2024.
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