@ facten @knownothing Thank you both for your replies. I like the thought of a tube DAC. I don't want fatiguing anything. For clarification, I have a desktop computer feeding a Dragonfly black which is feeding a Conrad Johnson PV-10AL which is feeding an Audiophonics LPA-S500NC into KEF LS50's.
It sounds like even a $400 DAC is going to be an improvement provided I find one that suits my tastes. I like that ultra tubey sound. Euphonic is the word I hear used to describe the sound I like. Marantz back in the day used to have what was referred to as the "two martini sound". I have always been a fan of vintage Marantz sound.
It sounds like both of you liked the Chord line of DAC's, and for reasons I can appreciate. I'll read reviews and compare the Mojo's to some of the Topping DAC's like the E70 Velvet and the Denefrips Aries. I read a review that described the Velvet as sounding warm and non fatiguing, but than I read another review that didn't describe it that way.
Anyway, thank you both so much for your thoughtful replies. I may just buy several DAC's from Amazon or other outlets that allow returns and test until I find what suits me. Thanks again.
Matt