Can I use my passive preamp with tube amps?

If you're asking why he'd want to go to tube monoblocks: If you really need an explanation, you wouldn't understand.

In terms of impedance matching, a passive will in most cases work better with tube amps, they are simply easier loads to drive. What is the input sensitivty of you amps? What is the output volatage of the DAC? In all likelyhood, it will be a very good match.

Rodman99999999999999

That was not what I was asking. I was asking why he would want to use a passive preamp.

The fewer things in the reproduction chain, the better it sounds. Nothing sounds as good as nothing is a reasonably accurate description. I use both but for the greatest detail passive is very hard to beat. Some will still prefer active but passive should be tried by anyone with doubts. Stan Wallen, Alternative Audio

Perhaps he wants his music to sound real, rather than to sound like audio. He did say that he prefers the sound with a passive. Stan's comment is right on the money. The goal used to be called, "straight wire, with gain."