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The EF95/6AK5 is an amplifier pentode that is physically small and the electrode assembly is no more than a 10 mm cube. The use of this device lay in low noise RF amplification at VHF.

The American Type designation 6AK5 was the industry standard name.

See also 5654 special quality version of the 6AK5.

The anode box and the 6AK5 on the glass.

The Three wire grids of a true pentode are all visible.

The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 40 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 6AK5 was first introduced in 1942. See also 1942 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.