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AC Adapter for Trace Elliot SMX Dual Compressor

Looking at Reverb sold listings with good photos of the power supply in conjunction with the information found from the Ovnilab site review it requires a center negative ("standard polarity") 18v power supply with a 2.5mm barrel. Most standard boss style plugs are 2.1mm.
 
From the SM7EQ manual, the power requirements for the SMX are the same. I used to own both.

TECHNICAL SPECIFICATIONS
INPUT
Impedance 250k Ohms
Signal level 600mV nominal, 6v max
OUTPUT
Impedance 15k Ohms
Signal level Nominal level 600mV
SUPPLY
Internal Average load Max load Average life External supply
18v from 2, 9v batteries (MN1604) 6.5mA
10mA
75 hours
18v DC adaptor. Centre pin negative