Sensibly equivalent¶ to:
The VT61 transmitting double triode covers the VHF frequency range. The triode can be driven hard and this valve can accept a grid current of 15 mA. The number of equivalent types attests to its utility.
The VT indicates a pre CV Register valve Type specified by the RAF. The VT61 was employed as the modulator valve in the transmitter of the 'Spitfire' fighter plane of WWII.
The base cap is ceramic and impervious to moisture, a clear sign of a valve designed for aircraft use.
The classic envelope is 42 mm in diameter and, excluding the UX7 base pins, is 110 mm tall.
References: Datasheet. Type VT61 was first introduced in 1938.
Absolute Maximum Operating Conditions¶
Updated August 02, 2015.