The 2.5mm adaptor sort of worked, but not reliably. I lose power if it is jostled. Looks like the inner diameter is a tad bit too big so it makes contact, but just barely.
I had multiple 2.1mm adaptors and one just happened to fit perfectly. Small variations in tolerances in manufacturing?
Love my BB. Singular Sound has made a great product. But why SS does not sell the replacement AC adaptor is beyond me. Make a profit. That is understandable and fine. Such an important component to the BB and something that can easily fry your BB if the incorrect one is used. Car lots normally sell tires too. Cell phone stores sell USB and AC cords. Just sayin’…
Few pedal manufacturers do this. In fact many don’t even provide a power adaptor in the box!
It would be good for them to clearly list some recommended replacements with links to purchase off site. Perhaps do this in places on the main web site (Support/FAQ) and store (and avoid assuming if the info is in the forum, it is accessible).
Now if the 2.0mm socket is non-standard, this becomes a bit more problematic.