Transcription of A Low-Mu Triode Preamp - pmillett.com
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A Low-Mu Triode Preamp - pmillett.com
Just about every stereo systemuses a Preamp or line amplifier,if you prefer. This article de-scribes a Preamp (Photo 1) that sa little different from most, using Low-Mu power triodes to get good perfor-mance with only one amplifier stage,and no negative DO WE NEED A Preamp ?The most visible functions of a preampare to provide source signal selection( , CD player, phono Preamp , and soforth) and volume control for youraudio system. A Preamp doesn t reallyneed very much voltage gain; in fact,some designs, called passive pre-amps, don t have an amplifier stage atall. There is much to be said for thesedesigns after all, with no gain stageand only switches and passive attenua-tors in the signal path, the noise anddistortion performance is hard to why would we need an amplifier?
upper tube acting as both a cathode fol-lower and a plate load for the lower tube. These circuits can achieve very low distortion and output impedance as
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