ответ Пиви по поводу а нафихга нам биас
Осторожно , английской
The range of adjustment would swing between about (-)50V to (-)58V. A lower voltage is " hotter " ( tubes run at a hotter temperature ) and higher is " colder " ( too high, and there is more crossover distortion.
The bias adjustment is to minimize / prevent " crossover distortion " in the power tubes.
The bias may be tested and typically adjusted when the power tubes are replaced.
Crossover distortion is the term given to a type of distortion that occurs in push-pull class AB or class B amplifiers. It happens during the time that one side of the output stage shuts off, and the other turns on. Depending upon the bias point, there is a small amount of time where both tubes are in very non-linear portions of their operating curves, or even cut off entirely, and this "kink" or non linear shape in the transfer curves results in a distortion, or notch, at the zero crossing point of the reconstructed waveform. The bias voltage (and thus, the bias current) affects the amount of crossover distortion.
A class AB amplifier can produce a varying amount of crossover distortion, depending upon where the bias point is set. This crossover distortion is composed of mainly third harmonic distortion, with a bit of fifth harmonic distortion as well. A qualified repair technician would have to have test equipment such as an oscilloscope to see this distortion.
П с на показатели от и до 50-58В не смотреть. это для 6505-
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