Buffered Pre-out? What is it?

I have a preamp that has a "normal" pre-out for short IC's and a "buffered" pre-out for long IC runs (not balanced). I assume the buffering is to keep noise down. What is the electronic or operational concept behind this type of buffering? Anyone know?

Thanks and Best Regards,

Showing 1 response by eldartford

A buffer stage has a gain of 1 (or sometimes a slight attenuation). In general such a low gain circuit, either a tube (cathode follower) or a transistor, has virtually no distortion... certainly way less than the associated gain stages. A buffer output stage prevents signal deterioration due to loading of gain stages that have high impedance output, so it is puzling that the manufacturer says not to use it. Perhaps he is catering to those who believe that ANY additional circuitry is always bad. These folk ignore the loading effect on the "naked" gain stage.