There’s a mystique in audiophile circles about tube amplifiers. They can have a very nice sound which is attributed to their even-harmonic distortion, but they are often portrayed as requiring rare ...

The project was designed using 6T9 vacuum tubes to build an amplifier device that operates in Ultra-Linear (UL) mode. The tube amplifier circuit works better in Ultra-Linear mode which used to operate ...

In a world full of digital modelling and mass-produced amplifiers, Dr Z has built a reputation the old-fashioned way: by building hand-wired tube amplifiers that players fall in love with and never ...