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The CV5077 is a PL81 in UK service form, physically it is identical to the PL81. It was designed for universal mains television sets, i.e. without a mains transformer and with the heaters on a series chain. Parameters given are for a pair in push pull audio service, but this was never the design use.

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

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 71 mm tall.

References: Data-sheet & ¹⁰⁴⁰.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.