I have a CAL Sigma DAC and would like to know if anyone out there has tried different tubes in this unit and which one would you recommend. It takes One 12AX7 tube. I currently have a an old Amperex in there now. Any thoghts on this would be greatly appreciated.
Yep - I'm still using an old one. I'm presently using a new production Tung Sol 12AX7A. Nice combo of warm and detailed. In my system.............
I had a Telefunken ECC83 in mine, and the combo was excellent. So much so that when I got my Alpha, I went with a NOS pair of the same.