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The 6BE6 is a heptode or pentagrid converter. This exhibit was made in Japan.

The heptode is classically used as a frequency changer in a superhet receiver. Radio and Television both use the superhet principle. To change frequency the incoming signal is mixed with a local oscillator. The electron stream is effectively switched on and off by the oscillator. In practice the process is one of producing sum and difference frequencies rather than just mixing of two signals.

To prevent the oscillator and the signal interfering in unplanned ways a screening grid keeps the circuits apart.

The cut-away side of the anode reveals the notch and peen fixing of the outer grid wire to its support rod.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 6BE6 was first introduced in 1950. See also 1950 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.