Know nothing of the circuit sorry, but Roger has an exceedingly keen ear for great tone... all his products make music.
The Ruby pre's most obvious trait is its explosive dynamics. Far more powerful than my Supratek Cabernet Dual with separate tube-regulated power supply, which is no slouch. Odd that, given the Ruby's lack of separate PS...
The tone is extremely detailed and transparent, bass is well resolved, treble is airy and silky. If I could detract at all, it might be that the tone errs slightly to the warm (musical) side of neutral, which I prefer anyway.
The Ruby pre's most obvious trait is its explosive dynamics. Far more powerful than my Supratek Cabernet Dual with separate tube-regulated power supply, which is no slouch. Odd that, given the Ruby's lack of separate PS...
The tone is extremely detailed and transparent, bass is well resolved, treble is airy and silky. If I could detract at all, it might be that the tone errs slightly to the warm (musical) side of neutral, which I prefer anyway.