Responses from theaudioman

Upgrade from Cal CL-15 ?
Has anyone found a way to get digital signal (output) out of the CL 15? I would like to upgrade by adding a digital processor to my system, but there is no out.... Is it possible to tap output signals from the inards??? 
Tube upgrades for SF Line Preamp
Have you tried the mullards, direct from SF? Give them a call