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Boss PSA-120S AC Adapter for BOSS Pedals

BH #BOPSA120S2 • MFR #PSA-120S2
Boss PSA-120S AC Adapter for BOSS Pedals
Key Features
  • For BOSS Multi-FX, Compact &Twin Pedals
The BOSS PSA-120S is a 120V, 500 mA AC adapter for BOSS Compact and Twin pedals, multi-effects units, and more.
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Boss PSA-120S Overview

The BOSS PSA-120S is a 120V, 500 mA AC adapter for BOSS Compact and Twin pedals, multi-effects units, and more.

  • 500 mA of current
  • Power cable almost 10 feet
  • LED indicator for quick visual verification of on/off status
  • Does not cover adjacent power outlets


UPC: 761294402450

Boss PSA-120S Specs

Packaging Info
Package Weight0.345 lb
Box Dimensions (LxWxH)5.8 x 3 x 1.8"

Boss PSA-120S Reviews

Good power with no noise

By Brianne
Rated 5 out of 5
Date: 2021-05-04

I have this running my Boss ME-80 and I am very happy with it. It adds no noise that I can discern. It delivers good stable power so it does what they say it is supposed to do. It isn't cheap but you get what you pay for I suppose.

A must have

By Larry
Rated 5 out of 5
Date: 2019-10-10

I play aerophone ae-10g and found that is the best bet to not rely on batteries not going dead on a gig. This made adapter for unit a must have as i play tenor sax and ve-20 gets heavy use at gigs and practice.

Plug in & start playing

By Steven
Rated 4 out of 5
Date: 2019-09-12

It works like it's supposed to, right out of the box. I plugged it into my 10-year old Crunch Box and sounded like I could be in The Raconteurs. Time will tell whether it holds up. I'll add a star if it keeps on working!

Excellent Product

By leon
Rated 5 out of 5
Date: 2017-06-29


Worth it.

By Brian
Rated 5 out of 5
Date: 2021-01-26

Not a cheap pedal for me, considered buying a cheap universal power supply, but using the wrong power supply totally fried my last pedal so I can’t recommend getting this official boss pedal enough.

Just the right thing for power hungry pedals

By Peter
Rated 5 out of 5
Date: 2020-08-12

The Boss RC-3 Loop Station is awesome and just as power-hungry. This well-made power supply keeps the Loop Station working and pays for itself in the time that you go through six 9V batteries.

ordered for Boss GT1B

By Paul
Rated 5 out of 5
Date: 2020-06-15

Works great for Boss GT1B effects pedal. It has the correct ma and volts needed and arrived before they said it would. Very satisfied with this order.

Accept no knockoffs

By Steven
Rated 5 out of 5
Date: 2020-05-25

This is a regulated power supply unlike many on eBay claiming to be the same for ten twelve bucks. It’s hard to swallow paying $29.95 for an AC adapter, but do not play around if you have a Boss pedal (an RC3 Loop Station in my case) that specifies “Use PSA adapter only. They will likely introduce 60 cycle hum and fry your beloved stomp box in time. Also, even with one PSA in line it will regulate other unregulated power supplies (Boss ACA for example) in series with your pedal board.

See any errors on this page? Let us know



What is the DC voltage?
Asked by: Anonymous
About 9 volts.
Answered by: Mark S.
Date published: 2018-08-26


please show me +,- plug sign
Asked by: G G.
The center is negative and the outer contact is positive on the recommended adapter.
Answered by: KENNETH F.
Date published: 2021-11-23
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