In the past i’ve owned a California Audio Lab’s (CAL) Alpha, a Audio Alchemy Digital Decoding Engine v10 (DAC) and a Musical Fidelity Tri-Vista. These days they are all considered very vintage. Of the three, the Tri-Vista was the better, followed by the CAL Alpha, yet the AA DAC was pretty good, looking back.
Of the 3 the Audio Alchemy device may have the lowest current value.
The strange thing is, I never sold the CAL or the AA and have them stored away.
