This valve is a co-axial triode similar to the VT90 in general construction but lacks the clear route for forced air cooling. The ceramic envelope indicates a high working temperature. Perhaps the central anode was cooled by conduction and this was designed for aircraft use. The CV15 was certainly designed for conduction cooling.![](../pics/acl0046a.jpg)
The grid connection and inside of the end can be seen the metal evacuation tube seal.![](../pics/acl0046b.jpg)
The heater/cathode connections. The + sign shows that this could be a directly heated type with a tungsten or throiated tungsten filament. At 1.2 Volts it draws 6.0 Amps and is almost certainly directly heated in the same way as the CV15.![](../pics/acl0046c.jpg)
The design looks to be a high temperature device.The co-axial envelope is 16 mm in diameter, and excluding the base pins is 97 mm tall.References: Observation. |
Updated April 11, 2019.
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