A New Audio Output Valve with an anode dissipation of 35 Watts

An addition to the well tried and popular range of GEC Audio Valves, of which the KT66 has set a standard in its class the world over, the new GEC KT88 is now available to meet conditions of use requiring higher power.

Points about the KT88

1. The KT88 is a beam pentode with aligned grids for maximum efficiency.
2. 50 watts output is available from a pair connected in the ultra linear circuit with auto bias and an HT line voltage not exceeding 500.
3. 100 watts output is available from a pair connected in the ultra linear circuit with fixed bias and an HT voltage not exceeding 560.
4. 25 watts output is available from a pair triode connected aith auto bias and an HT line voltage not exceeding 500.
5. The mutual conductance of the KT88 is 11mA/V
6. An all-glass ring seal replaces the conventional pinch seal giving increased strength, higher rating and reduced dimensions.
7. The valve is mounted on an international octal base and has a heater rating of 6.3 volts., 1.8 amps.

The General Electric Co. Ltd., Magnet House, Kingsway, London WC2

Valve Data: KT88

(Data taken from GEC 1957 Valve Data sheet, which calls this valve a tetrode and lists the price as £1 2s 6d plus tax)

1.8A, 6.3V Heater
Octal base