Selling my 6B, it only has the XLR connectors (not the newer DB25), but is not one of the extremely older models--this has one of the new power supplies and better shielding, etc, than the older models. Always used in a smoke-free environment.
It also has a wire tacked between pin 6 on slots 1 and 3 so you can link double-wide units like the Buzz Essence/Potion. Only selling this because I just got a bigger 500 series rack, no problem with this unit whatsoever.
Asking $380.00, continental U.S. deliveries, free shipping!