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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 ...
Tubes are usually fixed biased with an external negative power supply ('C battery'); each side normally has independent bias adjustment to compensate for minor tube mismatch. Output impedance Z of a transformerless circlotron where each stage is a single triode with plate impedance of R p and voltage gain of μ is defined by the formula
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.
The simplest klystron tube is the two-cavity klystron. In this tube there are two microwave cavity resonators, the "catcher" and the "buncher". When used as an amplifier, the weak microwave signal to be amplified is applied to the buncher cavity through a coaxial cable or waveguide, and the amplified signal is extracted from the catcher cavity.
However, the plate dissipation of the 6L6GC, at 30W, exceeds the KT66's 25W, and adjustment of the amplifier's bias is necessary. M-OV ceased glass vacuum tube manufacturing in 1988; their old audio tube types became valuable collectibles.
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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The bias network is designed to preserve the applied AC signal. Similarly, amplifiers using field-effect transistors or vacuum tubes also have bias circuits. The operating point of an amplifier greatly affects its characteristics of distortion and efficiency; power amplifier classes are distinguished by the operating point set by the DC bias.