It is 3mm on the inside, 6.3mm on the outside, part number 27-860. However, I was finally able to obtain a suitable replacement from MCM Electronics. The dimensions of the coaxial barrel power plug are rather large and difficult to locate. Any higher amp rating will work as long as the voltage is AC, not DC. For those of you who might have a need someday to replace the wall-wart transformer for your SPD-20 (or presumably your SPD-11), here's the specs to match the BOSS BRA-120 unit:
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