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The PY33 is an HT rectifier for television receivers. It operates directly from the mains input and with a series resistance of 25 Ohms it will feed a reservoir capacitor of 200 µF. The 300 mA heater was the standard for TV receivers from the 1960s.

The advantage of the PY33 was a voltage drop across the valve of only 10 Volts made possible by an ultra smooth cathode coating.

The stitched anode was made with four heat radiating flanges in an X configuration.

The wide glass tube envelope is 32 mm in diameter, and excluding the IO base pins, is 94 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type PY33 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.