The Ediswan PV8DE is a low impedance audio output triode and differs only slightly from the PV6DE apart from the filament parameters. The PV indicates a power valve and the DE stands for dull emitter.
The simple split pin base pins. The faint etched identification can just be seen. It says that the filament has a maximum rating of 3.0 Volts and that it is a dull emitter.
The balloon envelope is 44 mm in diameter, and excluding the B4 base pins is 87 mm tall.
References: Datasheet, 1047 & 1003. Type PV8DE was first introduced in 1925.
Absolute Maximum Operating Conditions¶
Updated June 30, 2017. shape:balloon construction:pinch type:triode age:1920.1930 base:b4 pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f