Howdy. Time to thin the herd, as painful as it is. I just bought a new house and the excess toys have got to go! If I was still playing in a rock band i'd never sell it, but my needs just don't demand the big tube amp right now. I know I will regret this eventually. I really can't say enough about how good this combination sounds. By itself, the 680 is a recording powerhouse. Amazing sound when paired with a SS poweramp, nice and thick yet clear and incredibly punchy. Add the DB728, and the sound is instantly 12 tons of hefty bass thickness, yet still so clear chords ring true. It's a beautiful thing. I gotta stop or I won't be able to hit submit. Both have been recently retubed and biased. The 680 was just at the Aguilar shop for a complete overhaul. Near mint condition. Always racked. DB728 - SOLD! DB680 - SOLD! Thanks! Let me know if you have trades or questions.