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The PL36 was designed as a line timebase output valve for television receivers. The valve was a popular design and made by several companies. We also have a Mullard exhibit of the PL36 as well as a NOS Mazda PL36.

The design dates to the 1950s, when sets were black and white and screen sizes of 14 - 17 inches diagonal was common.

The maximum positive peak voltage on the anode is 7 kV with a 10 W dissipation. The screen dissipation is up to 5 W and the grid is designed to withstand negative peaks of 1000 Volts.

The close-up of the valve shows the internal construction. Very close to the central cathode can be seen the control grid, with the screen grid as the most visible spiral wire. There is no suppressor grid, instead one can see the beam forming plates. In practice this Output Pentode is a Beam Tetrode.

The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 90 mm tall.

References: Data-sheet, ³⁰⁰² & ¹⁰⁴⁰. Type PL36 was first introduced in 1955. See also 1955 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.