The VR35 is a British Military valve with a commercial equivalent of the M-OV QP21. The valve is directly heated and for battery HT sets. The pair of pentodes were designed to operate in Class B1 and so draw very little standing current. An important fact when the cost of HT batteries was significant. The screen grid is also common to both valves.
The output power was of the order of 0.5 Watt and the anode to anode load was quoted at 25,000 Ohms.
The space above the pinch is filled with the interconnections.
The dome carries the Type designation and the old stores code of 10E/9779.
The classic envelope is 36 mm in diameter, and excluding the B7 base pins, is 90 mm tall.
References: Data-sheet & 1043. Type VR35 was first introduced in 1934. See also1934 adverts.
