Generally speaking, I've found tubes to be warmer. There are exceptions, of course. I don't think the Air 20 has a built in pre, more like attenuation for the amp. It can also run in analog mode.
In response to Mtich- thank you. What pre did you wind up with after the Sunfire?
Also- do you know if the Sunfire has a truly balanced output or are they just XLR outputs without a balanced circuit?
In response to Mtich- thank you. What pre did you wind up with after the Sunfire?
Also- do you know if the Sunfire has a truly balanced output or are they just XLR outputs without a balanced circuit?