The EZ12 is an indirectly heated full wave high vacuum rectifier. The pin connections are the same as the EZ11 but the rating is twice the voltage and twice the current.
The presence of the word Wehrmacht dates this exhibit to between 1936 and 1945. The EZ12 was still being made in the 1950s.
The logo is for the testing station. The letters are missing but the number is 1490.
The central cathode passes through both anodes. The anodes are double ended and the metal is bent into two open cylinders either side of the cathode.
The footless base with central locating spigot.
The identification is etched into the dome of the envelope. The anode shape can be clearly seen through the top mica as can the oxide coated cathode tube.
A closer view.
The classic envelope is 38 mm in diameter and, excluding the Footless base pins, is 81 mm tall.
Reference: Data-sheet. Type EZ12 was first introduced in 1938. See also1938 adverts.
