The VX prefix indicates a Brimar/STC development sample. This valve the VX7509 looks to have the same pin connections to the EF91 but no data has yet been found.
There is a central band of coating within the envelope.The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.References: Observation. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |  g1 | k | h | h | a | g3 | g2 |
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Updated March 12, 2021.
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