24” and 14” (60cms and 35cms) long, these
respectively air-cooled and oil-immersed kenotrons date probably to the
thirties or early forties. They have an extremely similar internal structure,
and the specifications on the partly obliterated labels seem closely similar.
On the other hand, the
oil-immersed kenotron (ML-?E) is close in size and conception to the Siemens V140/8G.