I buy this identical power supply for my Boss VF-1, is the original power supply, i needed for live or jam session with friends and my band.
Compare with my old power supply has a little and imperceptible noise, to hear it must be very concentraded and there must not be noise in room or place, this not create any problem to rack or sound.
Many old rack don't have spare parts or is difficult to find but thomann for my half rack solved my issue.
I have 2 boss VF-1 and I think that will buy another for my second multifx.