The Reliability of my Boss Katana Artist is...Shocking!

Masta' C

Well-known member
As many of you know, I'm a big fan of the Boss Katana amps. I still believe the tone-to-price ratio is unbeatable on these things. Since first trying the original KTN-50, I moved up to a KTN-100, and eventually to a Katana Artist, which is top-of-the-line in the series and an upgrade I recommend to anyone serious about the Katana series. I have REALLY enjoyed my investment in the Artist...until now.

First, let me say that the amp appears to function fine and still sounds great. At a glance, everything seems to be working as it should. The problem is...the amp is shocking me!

Not sure why, but it has begun to leak an electric charge. If I don't touch anything for 20-30 seconds while the amp is on, I get a small, but highly uncomfortable electric shock when I touch any metal part of the guitar. And this isn't happening on just a single guitar...it's happening with all of them! Same with the amp itself...if I wait a few seconds and then touch one of the bolt heads on top which support the chassis inside, I experience the same shock!

For initial trouble-shooting, I tried swapping the instrument cable for a brand new one. No luck. I tried swapping the removable power cable out for a new one. No luck. I tried it on different wall outlets and even in different rooms known to be on separate circuits. No luck. Still, concerned that something might be up with the home wiring that I couldn't evaluate so easily (note: I don't have this issue with any other electronic device in the house), I bought a fancy socket tester with a digital voltage readout and everything in the house has tested out fine, yet the shocks remain. Probably an internal grounding issue, but who knows.

What irritates me is that I'm outside of warranty on this thing, so I'll likely be out-of-pocket for any repairs. I'll contact Boss to verify that, but I find this incredibly upsetting for what should be a flagship product at a premium price. Thought others might want to know.
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

that sucks, nothing like your toys trying to kill you
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

Obviously the amp needs fixing and Boss should eat this one. Find out who the VP or President of marketing at Boss is and write them an actual letter that goes in the mail. Keep it brief and on point and include copies of any charges you incurred and polity request recompense.

Years ago I had a part in my Jeep go south that though out of warranty should not have given me problems. Wrote Mopar and they cut me a check for $1,300 to cover the repair.
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

Ah, you get used to it. I used an old amp without a ground plug on it for ages. If you plugged it into the wall the wrong way you would get zapped when touching the amp. Eventually I got smart and wrote a 'B' on the side of the plug that was supposed to go into the bigger slot on the outlet. Worked great until someone flipped the damned ground reverse switch on me.

:P
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

I had an issue with my Marshall that if I touched the strings on the guitar and not the body, Id get a shock, same with the amp, touch something metal on it, Id get a small zap, ended up the outlet was bad.
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

It's definitely not the outlets. As I mentioned, they've been checked and measured. The house is grounded properly. Plus, I've tried different circuits in the house with the same result.

Any idea why it takes 20-30 seconds for the charge to "build up" inside the amp/guitar before it will cause an apparent shock? Seems like that could be some sort of clue to someone who understands the internal workings of amps better than myself.
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

Ground
Could be the ground pin on the cord (my guess)
Could be loose where it connects inside amp

Easy replace
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

So the shock is only when you touch parts of the amp, but not when you touch the strings of the guitar or the plug on the guitar cable?
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

So the shock is only when you touch parts of the amp, but not when you touch the strings of the guitar or the plug on the guitar cable?

No, it's all of the above. The charge steadily increases if I don't touch anything and touching the strings, bridge, amp, etc. all result in an electric shock.
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

That is strange, I would definitely contact Boss! Warranties are one thing, but a safety issue should get their attention.

It's most likely a grounding issue somewhere, but I can't diagnose very well over the interwebs, and the building charge thing is strange, but again, don't know where to start over the internet.
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

Open up the amp and check that the ground connection on the power cable input port is properly making contact
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

Building charge is what happens when it doesn't have path to ground
Like a capacitor

You become path

That's what the ground conductor on the power cable does

Those over molded plugs break the ground off regularly

You can check the connection inside the amp as well
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

As a temporary fix you could probably solder a coat hanger to the chassis, and then stick the coat hanger in the ground hole an outlet while playing.
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

Probably rocking too hard. Try some Hall & Oats.
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

Open up the amp and check that the ground connection on the power cable input port is properly making contact
This would be my guess as well. That's probably the next simplest explanation remaining given what he's already checked.

Sent from my SM-G970W using Tapatalk
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

Any idea why it takes 20-30 seconds for the charge to "build up" inside the amp/guitar before it will cause an apparent shock? Seems like that could be some sort of clue to someone who understands the internal workings of amps better than myself.

That makes it sound like a power supply filter capacitor.

I’d definitely take the amp in for servicing. It shouldn’t be leaking current into the ground path.



Sent from my iPhone using Tapatalk
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

I thought maybe a capacitor due to the build up of the charge, as well, but an internal grounding issue is definitely a possibility.

Thank you guys.

I've reached out to Boss/Roland. I'll let you know how this pans out!
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

No, it's all of the above. The charge steadily increases if I don't touch anything and touching the strings, bridge, amp, etc. all result in an electric shock.

Does it go away if you ground the mass (plug, chassis, whatever) manually against the ground in an outlet (or against a radiator or something else grounded)?
 
Re: The Reliability of my Boss Katana Artist is...Shocking!

I thought maybe a capacitor due to the build up of the charge, as well, but an internal grounding issue is definitely a possibility.

Thank you guys.

I've reached out to Boss/Roland. I'll let you know how this pans out!

It might be a leaky filter cap, but I it shouldn't be building up a charge like that, maybe if it was a tube amp. Definitely let us know what Boss says!

I have been Boss curious about the Artist versus the 100W head with my own 1-12 cab. I know the Artist has a much nicer cab and speaker, and moves some of the functions that are available in the software to actual knobs on the panel. Are there actual internal/software tone differences? I know it would be kinda redundant with my GT-1000, but the idea of just plugging into an amp is kinda nice.

Also kinda depends on how they treat you as well, this is definitely something they should address.
 
Last edited:
Back
Top