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The 6AM5 is a miniature audio output pentode. In single ended configuration it will produce 1.4 Watts, enough for a small broadcast receiver.

If used in push pull an output of 4 Watts is possible, but this valve was not expected to be used for hi-fi and for a radiogram there would be sufficient space to specify a physically larger valve.

The side view reveals that the grid support rods are copper for good heat transfer. Output valves in the B7G base format ran very hot.

The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 46 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 6AM5 was first introduced in 1949. See also 1949 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.