2 of 2 people found the following review helpful
Don't blame the psu!,
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This review is from: 9V Behringer PSU-SB PSU part replacement power supply adaptor (Personal Computers)
Bought this for a vocal mic to amp. Significant mains hum. Eventually established that the sheath on the balanced mic cables (XLR and 1/4" TRS) was acting as the aerial making noise. Incorporated a balanced to unbalanced TS jack in cable and problem solved. Moral: Don't blame this unit for noise until you have fully investigated the true source of problem. Unit is performing perfectly and without the need to replace fiddly, costly batteries.