I'm skeptical of this. It sounds like the problem is blaming the solution. Tubes are a lot more of a variation from constency than solid state or digital. So it's very unlikely that you can say that a digital system can make a tube system sound bad, the reverse is 100 times more likely. DEQX is a pure digital system - if you keep a signal digital and don't compress it, and pass it into a DEQX system, there will be no loss until you decode the system to analog and this is very slight at worst and then on into the amps and drivers. Don't worry about it, IOW.