Passive pre-amplifier

preampThis “passive” pre-amplifier is nothing more than an input-selector switch and a transformer attenuator to adjust the signal volume. In comparison to using a potentiometer (or a switchable array of discrete resistors), which attenuates the signal voltage by dissipating some (or most) of the signal power, a transformer attenuator has the advantage of passing the full power to the amplifier. With the transformer attenuator, the source can therefore drive the line stage and the power amplifier much better.

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