The 832 is an American dual transmitting tetrode. We also have the later 832A in the museum. Both types have centre tapped heaters to allow for 12.6 or 6.3 Volt working.
This is an original 832 with the round base below the central band. Later the envelope had a flatter base as can be seen in CV788.
The design the American type with two separate valves sealed into the single element, contrast this with QQE03-20 which is the classic European pattern. In use the American valves require external neutralisation capacitors whereas the European type has the capacitors built-in.
This valve was obsolete by the start of the 1960s replaced by the QQV03-20 or QQV06-40A varieties. It is typical of these RF power tetrodes that the base connections all match one another.
We cannot find accurate introduction date information but early to mid 1940's seems probable.
Made by National Union in USA.
The maker code on the left. One anode is seen face on and the wire grids can be seen at the base of the anode.
The twin independent sections are identical with curved anodes. As the pins are sited equi-spaced around the base, the locating pin has sleeve over it to increase the diameter.
The wide glass tube envelope reaches a maximum diameter of 50 mm, and excluding the B7A base pins, is 74 mm tall.
Reference: Data-sheet. Type 832 was first introduced in 1938. See also1938 adverts.
