KT66
From Wikipedia, the free encyclopedia
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.[1][2] 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.[3][4] In the 21st century, the KT66 is manufactured and used in some high fidelity audio amplifiers and musical instrument amplifiers.
Quick Facts Classification, Service ...
KT66 | |
---|---|
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)
| |
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 |
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