The Penta Laboratories KT66 is a high slope, indirectly heated beam triode designed principally for use in the output stage of audio amplifiers. It may also be used as an oscillator or R.F. power amplifier for frequencies up to 30Mc/s.
It is suitable for either single or push-pull audio operation, and may be employed as a triode with screen connected through a 100 ohm resistor to the anode.
The KT88 has an absolute maximum anode dissipation rating of 50W and is designed for use in the output stage of an A.F. amplifier. Two tubes in Class AB1 give a continuous output of up to 120W. The KT88 is also suitable for use as a series tube in a stabilized power supply.