I have this Boss GE-7 eq from the 90's that doesn't work on a modern 9v power supply (ACA instead of the modern PSA power supply). It works if you daisy chain it to another Boss pedal or just use a battery. I found a simple mod to address this.
You just solder a jumper to bypass a diode and resistor so it functions as if it's running off the battery. This will work with most older Boss pedals that require an ACA adaptor, but the locations will be different.
Негізгі бет Boss ACA to PSA mod to use older Boss pedals with modern power supplies
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