What to replace CAL ALPHA dac

"The type of tubes you use in this unit can produce a wide range of tonal response."

The bias is set for the original tube and is not user adjustable. The original tube will usually give the most neutral sound. If my memory serves me well the Delta, in its original form, is already on the warm side. The transport makes a big difference on this one.

Newbee, Correction on my previous post. The Alpha was warm sounding. The Delta was a really good transport. In my opinion everything from CAL back then sounded good. The only product I had reservations about was the Tercet. It was bright compared to the rest of their products. Most of my listening at that time was through the CAL Aria. Then I used the Delta transport with a Proceed PDP DAC until I got a PDT transport which turned out to be and excellent combination with the right cable. After that I went back to a single box unit the Kinergetics KCD40 and I still use a single box Audio Research CD3 MKII which is terrific. I have also been listening to some of the early Philips based 1541 and 1543 dual DAC players with interesting results.

Newbee, I found the Proceed PDT/PDP very sensitive to the digital cable. This combination was very neutral, but some body could be added with the right cable. I used the Proceed separates with ESP Concert Grand speakers, Quicksilver Silver monos and Quicksilver Full Function preamp. With most recordings the sound was excellent. However, my next CD player was selected to have more warmth.

Oddiofyl, I have said the same thing about many items I have owned in the past, but I always wonder if I would like it as much now as I did then.