This AC adapter powers several older models of Dunlop pedals, which required a 3.5 mm, or 1/8″, plug as opposed to the 5.5mm x 2.1mm barrel plug required by current models.
Models which used this power supply include: EW95V, GCB81, GCB95 (old version), GCB95FW (old version), GCB95O, GCB100 (old version).
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