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Class B vacuum tube amplifiers are usually operated with grid current (class B 2). The bias voltage source must have low resistance and be able to supply the grid current. [3] When tubes designed for class B are employed, the bias can be as little as zero. Class C amplifiers are biased negatively at a point well beyond plate current cutoff ...
Historically referred to as the "Q" or bias point by engineers, the operating point of a vacuum tube is a condition generally fixed by the amplifier manufacturer. In general, the operating point determines the device's bias value at zero signal input and determines the distribution of harmonics introduced into the output of the amplifier.
The Roland Micro Cube, left, a small and portable digital modeling amplifier. Digital amp modelers Standalone modeling devices such as the Line 6 POD and Fractal Axe-FX digitize the input signal and use a DSP, a dedicated microprocessor, to process the signal with digital computation, attempting to achieve the sound of expensive professional amplifiers in a much less costly and more compact ...
The biasing of a push–pull output stage can be adjusted (at the design stage, usually not in a finished amplifier) between class A (giving best open-loop linearity) through classes AB1 and AB2, to class B (giving greatest power and efficiency from a given power supply, output valves and output transformer).
In electronics, cathode bias (also known as self-bias, or automatic bias) is a technique used with vacuum tubes to make the direct current (dc) cathode voltage positive in relation to the negative side of the plate voltage supply by an amount equal to the magnitude of the desired grid bias voltage.
Bias voltage-15V: Anode resistance: 12 kilohms: Typical class-AB amplifier operation (Values are for two tubes) Power output: 100W: Anode voltage: 600V: Anode current: 100mA: Screen voltage: 350V: Bias voltage-45 (class AB2) References; Super Radiotron Tube Manual, Amalgamated Wireless Valve Co. Australia, June 1962 Radio Tube Data, Eighth Ed ...
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In electronics, faithful amplification is the amplification of a signal, particularly a weak one, by a triode or a transistor such that the signal changes in amplitude but not in shape.