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VT20Sensibly equivalent¶ to:
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The VT20 battery triode was designed as an audio output valve. With a maximum output of 190 mW it would be used with headphones and not a loudspeaker.We have two versions of this exhibit, this one is the earlier of the two and is typically Cossor in shape and is fitted with a standard Cossor base cap of the mid-1930s. The later example of VT20 looks M-OV in shape, despite the Cossor marking, and is fitted with a standard M-OV base cap of WWII period.The balloon envelope is 40 mm in diameter and, excluding the B4 base pins, is 84 mm tall.References: Data-sheet & private communication. Type VT20 was first introduced in 1929. See also 1929 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | a | g1 | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | Pout |
| 2.0 | 0.2 | 150 | -7.5 | 11 | 4,000 | 2.25 | 0.19W |
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Updated December03, 2012.
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