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The UL41 is an audio output pentode. The U series were designed to operate with a series heater chain in the days when AC mains had not reached all parts of the country. These universal sets contained no mains transformers and the valves were designed for low anode voltage and higher anode current to provide adequate output.

The UL41 could produce 4.2 Watts at 10% distortion. The cathode resistor 160 Ohms. The base of the envelope containing the pip is 21.5 mm in diameter.

The reverse of the envelope carries the BVA initials and that fact that it is a British made product.

The thin glass tube envelope is 20 mm in diameter, and excluding the B8A base pins is 69 mm tall.

References: Data-sheet, ³⁰⁰² & ¹⁰⁴⁰. Type UL41 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.