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The PY500A is an efficiency diode for use in colour television line scan circuits. The function is to return the energy from the collapsing line coil field at the end of the line scan to the HT rail.

The PY500A is a development of the PY500 and can be substituted for the earlier valve.

Thanks to Jonathan Marsh for the image.

The envelope is 28 mm in diameter, and excluding the B9D base pins is 105 mm tall.

Reference: Data-sheet. Type PY500A was first introduced in 1967. See also 1967 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.