Sensibly equivalent¶ to:
The Stentor Two was introduced by Cossor in 1927. The following year it was re-branded as the 215P and was still listed by Cossor in the mid 1930's by which time the 'New Process' filament was in use and filament consumption was 0.2 A to deliver a greater output.
Cossor also produced a 4 Volt version as the Stentor Four that was later re-branded as the 410P. The version for use with six volt accumulator's was the Stentor Six (later named 610P).
The condition of the paper around this exhibit is much better than our other Stentor Two, but the gettering obscures more of the inside.
Further information is included on the label such as filament rating and anode volts.
The balloon envelope is 42 mm in diameter, and excluding the B4 base pins is 87 mm tall.
References: Datasheet, 1043 & 1040. Type Stentor Two was first introduced in 1927.
Absolute Maximum Operating Conditions¶
Updated December24, 2012. shape:balloon construction:pinch type:triode age:1920.1930 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f