The pursuit of audiophile hi-fi is one upon which ... The audio side of the preamp comes courtesy of a four-tube kit from tubes 4 hi-fi, in which we notice another tube as power supply rectifier.

Around the back of the preamp, you'll find an array of analogue and digital connectivity. Inputs include three pairs of line level RCA, two pairs of balanced XLR, two S/PDIF and two optical ...