Sensibly equivalent¶ to:
The EF183 is a high gain amplifier pentode. It was used for RF amplification in television receivers.
The construction inside the mesh screen is of a flat cathode surrounded by flat grids, and is known as frame grid construction. On the sturdy support frame the grid wire is wound at about 50% of the wire's breaking strain. This gives a closely defined plane that the grid wire occupies. With such precision the grid to cathode separation can be extremely small and thus generate a high gm figure. The anode consists of two plates connected by straps on either side of the cathode and separated by 4 mm.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 52 mm tall.
References: Data-sheet & 1040. Type EF183 was first introduced in 1959. See also 1959 adverts.
Absolute Maximum Operating Conditions¶
Updated December04, 2016.