These mains adapters have been tested by an employee who is a musician as well as other guitarists using Boss stomp pedals.
Mains Adapter Power Supply for Boss Roland PEDAL PSU 9V 9 Volt 200 Mah PSA-230ES
PSU-4 16V AC/DC Adapter Power Supply for Blackstar ID Core 40 / Beam/Acoustic Core Stereo 40 V2 V3 Guitar Amp 40 20 Watt GLT-888 ADP0101600 TFB-BT1 Amplification USED004000
DC 9.5v 9.5 Volt Power Supply Mains Adapter for Casio CTK-240 Keyboard Pianos +
casio dc 9V AD-5 AD-5E AD-5MLE Power Supply mains Adapter for Keyboard Piano
DC 9.5v 9.5 Volt Power Supply Mains Adapter for Casio CTK-1200 Keyboard Pianos *
DC 9.5v 9.5 Volt Power Supply Mains Adapter AD-E95100L for Casio Keyboard Pianos
