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The CV8479 (commercially the TY4-400) is a power triode with an anode dissipation of 350 Watts and designed for use at full ratings at up to 100 MHz. It is directly heated with a thoriated tungsten filament.

The TY4-400 is described by Mullard as suitable for use as an RF amplifier or oscillator or as a class AB audio amplifier. In the latter case a pair of TY4-400s could produce 1,500 Watts output at 2% distortion.

The KB/P identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the P identifies the maker as Philips, Eindhoven, Holland.

The font used is characteristic of Mullard/Philips.

We also have the larger TY4-500 in the museum.

The graphite anode with double saucer fins for extra radiation cooling.

A code.

The sintered base with solid pins. There is almost no space between the anode and the lower screen. This prevents viewing the cage grid within.

The wide glass tube envelope is 84 mm in diameter, and excluding the base pins is 128 mm tall.

Reference: Data-sheet. Type CV8479 was first introduced in 1964. See also 1964 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.