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The CV15 is a directly heated triode with a thoriated tungsten filament. The envelope features a copper to glass seal and operating frequency is up to 300 MHz. The prototype was the experimental type E1266 from M-OV.
The E1266 is described by Vyse and Jessop as a block mounted VT90 with a smaller filament. The CV15 was used in the ASV (Air Surface Vessel) 70cm pulsed radar. In that application it was used in self oscillating mode with a grounded anode. At 204 MHz a push-pull pair would produce 1,500 1μS 10 KW pulses per second.
The data-sheet indicates that cooling is required even if only the heater supply is connected to keep the anode temperature below 140 °C.
The copper anode tube fixed to a brass base plate and with two glass to metal seals.
The filament wires and supports. Even under strong lighting the form of the filament is not visible. The bright ring is the end of the grid.
The grid is held in place only on the end of the grid support rod. The glass to metal seal is extended to reduce the stress on the envelope.
The wide glass tube envelope is 17 mm in diameter, and excluding the base pins is 112 mm tall.
References: Datasheet & 1005.


Absolute Maximum Operating Conditions
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 30, 2016.
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