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The N339 is a TV line output valve from the era of 405 line VHF monochrome television receivers.

The peak anode voltage can rise to 7,500 Volts and it has a 12 Watt anode dissipation and a 4.5 Watt screen dissipation.

The copper control grid supports connect to radiating fins above the top mica.

The base: the heater can be seen to be coiled inside its insulation. The cathode is a wide rectangular tube and the grid supports are made of copper.

The thin glass tube envelope is 21 mm in diameter, and excluding the B9A base pins is 71 mm tall.

References: Data-sheet, & ¹⁰⁴⁰. Type N339 was first introduced in 1952. See also 1952 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.