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This exhibit is a later EL41 with the metal skirt replaced by a wider section of the glass envelope and a location pip moulded into the glass. This exhibit is clearly used and the internal discolouration of the glass is clearly visible - this valve has had a hard life.

The EL41 is an output pentode rated for 9 Watts anode dissipation, and intended for use in AC mains operated equipment. The EL41 should only be used with self-bias or semi-automatic bias.

The locating pip is on the right. The style of seal between the hard glass of the pressed glass foot and the softer glass of the envelope is typical of Philips manufacture and so it is possible that this valve was made in England on machinery imported from the parent company.

The thin glass tube envelope is 20 mm in diameter and, excluding the B8A base pins, is 68 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type EL41 was first introduced in 1947. See also 1947 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.