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The N152 is the M-OV implementation of the design that is commonly known as PL81 and this valve carries both type designations. The main design function was as a line output valve in sets using a series heater chain at 300 mA. It can also be used successfully as a series pass valve in stabilised voltage circuits. Such circuits place heavy demands on the cathode and so does the line output circuit where the valve effectively acts as a switch and draws heavy current when turned on.

As a line output valve in television service, the peak anode surge voltage is 7,000 Volts. The anode dissipation is 8 Watts.

The control grid is wound on copper rods for good heat conduction and these supports art topped with radiating fins. This view, end on to the anode, shows the bright inner surface of the thin anode plate.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 72 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type N152 was first introduced in 1951. See also 1951 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.