Summary

A109 triode. Manufacturer: Philips, Holland. Introduced in 1925.
General purpose triode designed for use with a single 1.5 volt cell for the filament supply. 1 to 1.3 volt directly heated cathode.

Physical Description

Conical glass bulb with 4 pin American style (UX) base. It appears that an attempt has been made to resolder the pins.

More Information