My Teac A 6300 (I thought) was the best sounding R2R I'd heard until I got my Tandberg TD20 SE - by far the best sounding reel to reel I've ever had or heard over Tascam, Teac, Sony, Revox, Realistic, Akai I think I've had them all at some point, at least in the Mid-Fi non professional class however running it through my Krell KRC-3 Preamp, Krell KSA 250 into the Thiel CS5i's has a lot to do with it but as a source the Tandberg is up there with my Meridian CD player and Linn / Dynavector and one of the best sources in it's own way - maybe a better question is what is the best sounding reel to reel you've heard and list your associated equipment used with the unit?