Huge Machlett Kenotron

Ref. F3

This tube is 25” (63 cm) long with a six-inch (15 cm) diameter. Branded as type ML-8094/199, it probably dates back to the thirties of the 20th century.

It has a barrel-shaped cylindrical anode around a three-strand filament. Its specifications remain unknown.

It contains two small rectangular gettering metal frames, which are visible inside the filament end of the tube.

Machlett-Raytheon Huge Kenotron

Similar in size, shape and structure, this type ML-5576/200 Kenotron is almost a replica of the one above, with the exception of the small gettering frames. It bears on one side of its glass wall the typical MACHLETT brand with the type number, and on the opposite side, the RAYTHEON brand.