The LP2 battery triode was a popular design and very similar valves were produced by several companies. As an audio output valve it produced 0.18 Watts. The 2.0 V filament was designed to be supplied from a single lead-acid accumulator.The electrodes in this exhibit are mounted at an angle to the vertical making the top of the anode visible.![](../pics/aai0463a.jpg)
The Marconi brand label.![](../pics/aai0463b.jpg)
The Type designation is etched into the dome of the envelope. The double image is caused by a reflection from the inner surface of the glass as well as the front surface.![](../pics/aai0463c.jpg)
A close view of the construction.The balloon envelope is 44 mm in diameter and, excluding the B4 base pins, is 90 mm tall.References: Data-sheet, 1040 & 1043. Type LP2 was first introduced in 1930. See also 1930 adverts. |