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The PL504 is a purpose designed television pentode line output valve. It was introduced as a replacement for the PL500 and here we have an exhibit branded as Pinnacle.

The peak anode voltage is quoted as 7,000 Volts and shows why the line output stage of a television receiver was the last consumer electronics product to remain a valve. The CRT excepted of course.

TV line output valves found their way into amateur radio transmitters for service at HF (up to 30 MHz) because of their peak voltage characteristics and relatively high current capability.

The construction is as a beam tetrode and the anode has several folds to increase the surface area.

The wide glass tube envelope is 28 mm in diameter, and excluding the B9D base pins, is 92 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type PL504 was first introduced in 1961. See also 1961 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.