Sensibly equivalent¶ to:
The Cossor Stentor Four, dating from 1927, was later issued as the Cossor 410P audio output valve. It has a μ of 8 and was designed for a load of 9,000 Ohms.
The balloon envelope is 44 mm in diameter and, excluding the B4 base pins, is 95 mm tall.
References: Data-sheet, 1043 & 1040. Type Stentor Four was first introduced in 1927.
Absolute Maximum Operating Conditions¶
Updated November 26, 2012. shape:balloon construction:pinch type:triode age:1920.1930 base:b4 heater:4.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f