Join Date: Jan 2005
Location: Canberra, Australia
Re: QUESTION ABOUT BOSS ACA ADAPTOR
I just did a google search (as you would have been best to do before trying this). ACA adapters are unregulated, and originally were 12V supplies that had to be controlled to 9V in the pedal. There may be some ACA 9V adapters, but I think they are still unregulated.
PSA pedals are supposed to use the PSA compatible regulated 9V supplies. The pedals don't have the inbuilt protection that ACA pedals had. Running an ACA supply into a PSA pedal risks overloading the circuit, killing the pedal. You are lucky you used a 9V ACA, but I wouldn't keep doing that.