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This valve continues the 6L6 family, and has a glass disc construction that is fitted to an octal base. It is a reasonably powerful audio beam tetrode and was used, primarily, for audio amplifiers.

The valve is electrically equivalent to the 6L6 but is of a squat tubular construction. The cross box anode obscures the other electrodes but is obviously designed for good heat dissipation.

The 5881 was manufactured in the USA by GE, RCA, Sylvania and Westinghouse, our exhibit will have rebranded to Pinnacle.

The wide glass tube envelope is 33 mm in diameter and, excluding the IO base pins, is 72 mm tall.

References: Data-sheet & ³⁰⁰². Type 5881 was first introduced in 1954. See also 1954 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.