After a brief review of the history of the K2-W vacuum-tube op amp, an LTspice model is used to create its schematic in ...

iFi Audio says the ZEN Blue 3 has audiophile-grade circuitry instead of a System-on-a-Chip design. This means there are separate Bluetooth, DAC and Op-Amp chips for improved sound quality.

If you're looking for the glow of old-school tube amps ... edge audio tech, Astell & Kern has you covered: its new SP3000T hi-res audio player brings all the benefits of the best digital tech ...