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The EF83 is a variable-mu AF voltage amplifying pentode.

Lorenz is a German company that was taken over by the American ITT corporation.

Through the expanded metal screen can be seen the three wire grids. The suppressor grid has a wide pitch and is mounted close to the anode.

Below the lower mica is a screening plate that shields the control grid lead.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 48 mm tall.

References: Data-sheet, ³⁰⁰² & ¹⁰⁴⁰. Type EF83 was first introduced in 1956. See also 1956 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.