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The N155 audio output valve from M-OV and the EL85 from Mullard are electrically identical to the B8A based EL42. When used for single ended audio applications a load resistance 9000 Ohms is specified.

The Mullard specification also gives RF operation to the low VHF as an application, say, in mobile transmitters.

The design is of a true pentode with three wire grids visible through the side holes in the anode.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 58 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type N155 was first introduced in 1957. See also 1957 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.