Analysis of the circuit makes it clear, that the input tube is working without any global or local feedback, and at the same time provides the full output swing. Thus, the sound character of this ...

These preamps use different approaches: the Akliam/Domelec is a full tube unit, the BRZHIFI VOL-02 is a solid state unit, the BRZHIFI PAP-FV3-2 is a simple passive preamp, as well as the Tisbury Audio ...

[Justin Scott]’s tube preamplifier is a great example, with its novel use of a pair of Nixie tubes to indicate the volume to which it has been set. The audio side of the preamp comes courtesy of ...

The circuit is a pretty conventional single-ended one with a two stage double triode preamp and a single power output tube. The transformers are usually the difficult part of a build like this one ...

The other two mini toggles offer a choice of two mid-boost ... the potential to blow a speaker with the massive dynamics a tube preamp can produce into a power amp with so much power on tap ...