GE 6299 planar triode, measuring 26x13mm (the penny is 20mm across). 6.3V/300mA heater. The connnections as shown in the picture are: heater at the bottom, getter terminal, cathode/heater terminal, grid (the largest connection with the writing on), and anode at the top.
Markings are 67-24 and 68-09.
This file was last modified
15:44:51, Tuesday September 02, 2014