KT66

KT66
KT66
	Original G.E.C./M.O.V. KT66 Beam-Power Tetrode tube; this is an example from late production
Classification	Beam-Power Tetrode
Service	Class-A amplifier, (single-ended); Class-AB amplifier, (push–pull)
Cathode
Cathode type	Indirectly heated
Heater voltage	6.3
Heater current	1.27A
Anode
Max dissipation Watts	25
Max voltage	500
Socket connections
	Octal Base, (IO) Pin 1, Not Used; Pin 2, Heater; Pin-3, Anode/Plate; Pin-4, Screen Grid, g2; Pin-5, Control Grid, g1; Pin-6, Not Used; Pin-7, Heater; Pin-8, Cathode-Beam Plates;
Typical class-A amplifier operation
Anode voltage	250
Anode current	85mA
Screen voltage	250
Bias voltage	−15
Anode resistance	22K Ohms
Typical class-AB amplifier operation ; (Values are for two tubes)
Anode voltage	400
Anode current	62.5mA (Includes Screen Current)
Screen voltage	400
Bias voltage	−38, (Class AB1)
References
	Super Radiotron Valve Manual, Amalgamated Wireless Valve Co. Australia, June 1962; Radio Valve Data, Eighth Ed. Ilife Books Ltd., London, 1966

KT66 is the designator for a beam power tube introduced by Marconi-Osram Valve Co. Ltd. (M-OV) of Britain in 1937 and marketed for application as a power amplifier for audio frequencies and driver for radio frequencies. The KT66 is a beam tetrode that utilizes partially collimated electron beams to form a low potential space charge region between the anode and screen grid to return anode secondary emission electrons to the anode and offers significant performance improvements over comparable power pentodes. In the 21st century, the KT66 is manufactured and used in some high fidelity audio amplifiers and musical instrument amplifiers.

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