I had both TB10 and DB10. As noted, the only difference was the preamp. I gigged it with an added strap button, bass guitar style, or on its stick, upright style - video of latter here https://wilybo.com/acoustic-band-videos/1982-2/
It was thumpy and great for DB style sounds (I had my most recent, with the cool tube preamp, strung with Rotosound TruBass black nylon strings) but a bit heavy (especially in its tank-proof hard case) and clunky. I sold it in the end as I barely used it in the bands I played in. Were I to go acoustic Americana again, I would consider re-buying