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?The biggest problem (for me) with apassive Preamp is that its outputs havea relatively high source impedance,and one that tends to vary substantiallydepending on the position of the vol-ume control and the output impedanceof whatever is driving it.

load uses an active device (usually a tube or FET) that’s connected so that it always wants to supply a constant cur-rent to its load, which in this case is the

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