Boss PSA-120S Power Adapter

Fits perfectly, zero hum, no issues whatsoever. Bought and returned a third party adaptor previously that didn't fit and hummed like crazy. OEM has always been the best bet for me.

Works as promised

This power supply is highly recommended by BOSS and users as providing high quality, clean power. There are several aftermarket alternatives at far lower price but I have read that several do not provide a clean power signal and can damage guitar/bass effects boxes.

I purchased this to save batteries on my Boss ME25 Guitar Multi-Effects Pedal, which has a healthy appetite for them. I did consider a few after-market supplies, but opted for this one because I felt it was a safer choice.This will work with any 9 volt DC device that consumes up to (but does not exceed) .5 Amps. To make sure this is right for a non-Boss device check your connector receptacle. The male barrel connector on this adapter is 2.5mm x 5.5mm (inner x outer diameters). The piece right behind the barrel connector houses two coils that function as RF filters, and they do work on my BE-25, because it is noise-free.Another feature that makes this safe and handy for non-Boss devices is it has a protection circuit that will go into overload mode if the device to which you connect this requires more than 9 volts DC or attempts to draw more than .5 Amps.The wall wart is less than an inch thick and is about 2.25 inches long, so should not interfere with adjacent plugs in a power strip. The wire itself is fairly thick - much beefier than many power supplies I own, and there are four separate strain reliefs in the total wire run, so with care this power supply should last a long time.

This is an excellent power adapter that fully meets expectations. It is unquestionably an authentic PSA-120S unit, even arriving in official Boss/Roland packaging — a reassuring detail for anyone concerned about receiving a genuine product.I connected it to my Boss ME-90, and it performs flawlessly, delivering clean, consistent power while saving me a significant amount on AA batteries. Thus far, I’ve experienced no unwanted noise or interference. As the adapter officially recommended by Boss for their gear, it’s clear this unit was designed specifically with these devices in mind.While it is priced higher than many generic alternatives, the peace of mind that comes with using the manufacturer’s recommended product—especially when powering high-end equipment—is well worth the investment. I strongly recommend this adapter to anyone in need of a reliable PSA-120S solution.Overall, I give this product a 4.5 out of 5 stars. The only reason I’m not giving a full 5 stars is simply because I’ve only recently purchased it, and I’d like to see how it performs over time. That said, based on the build quality and performance so far, I don’t anticipate any issues.

Does what it says

If you want a great single 9 volt power supply for your pedal , that doesn't make your amp whistle or make other noises .. And don't wanna drag out the iso brick .. this is it ..

Awesome, now I don’t have to spend a fortune on batteries.