This battery triode was a four volt version of the LP2. As an audio output valve it produced 0.18 Watts.
Power was a pair of accumulators for the filament and a dry battery for the anode supply.
The balloon envelope is 42 mm in diameter and excluding the B4 base pins it is 90 mm high.
Reference: Private communication.
Absolute Maximum Operating Conditions¶
Updated January 04, 2013. shape:balloon construction:pinch type:triode age:1930.1940 base:b4 heater:4.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f