Preamps

The valves with the PRE -AMPLIFICATION function in Audio have mainly the function of electrically boosting the signal coming from a source (microphone or analogue or digital). Generally they can be used in two stages: entrance and pilot. They can also act as a phase inverter or other. The pre-amplification stage is generally high-gain, suitable for the first amplification of a signal of the order of tens of microvolts.

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