Yamaha THR10 Squealing Noise Fix

The Yamaha THR10, THR10X and THR10C are fantastic little practice amps, but they have a design flaw. When some of the wires inside get too close together, their signals interfere and a nasty high-pitched whining, squealing or ringing sound results. This may be constant, or only when you play, or only when the noise gate is off. It sounds like this:

Nowhere does there seem to be a guide to fixing this. When my THR10X showed up with this squealing issue, I opened it up, turned it on, and poked around with a pencil to find out what was happening. Turns out it’s a five minute fix. Follow this short tutorial and you’ll be whine free.

Caution: Amps and humans are fragile. Don’t touch anything you don’t have to. Static electricity stored in your body could zap a microchip, rendering your amp useless. Power stored in a capacitor could zap you, making you useless. Proceed at your own risk. I will not buy you a new amp or new hands.

1. Open Up

With the amp off and unplugged, remove all screws holding on the metal casing, including the four chrome hex bolts on the front, and open as shown.


These thick cables with the gray foam insulation are for the speakers. We’ll leave them alone.


We’re interested in this mess of smaller wires at the right edge of the board.


2. Fix It

The problem is that when cable A gets close to the bundle of wires at connector B, the interference generates a nasty squealing feedback sound.


Separating them even this much makes the sound disappear. Yamaha should not have designed the THR10 series with these wires so close to each other, and their flappy little piece of silver shielding between the two is apparently insufficient!


To keep cable A away from connector B permanently, and enjoy quiet, whine-free shredding forever more, secure cable A to this little circuit board with a cable tie.


It’s now impossible for the wires to get near each other. Carefully reassemble the amp and you are done with the repair for the cost of a cable tie.

48 Replies to “Yamaha THR10 Squealing Noise Fix”

  1. It is very useful!! The issue is now gone. Thanks.

  2. […] finding the thread through Google etc. might want a real solution. All you need is a cable tie! Here is my quick how-to […]

    1. Could you suggest a way to add a preamp out jack, so I can take my preferred modelings live? Some suggest using the headphone out with an adapter, but what about a perm hack, with hardwired cab mounted 1/4″ jack? I’d consider hardwiring a powered preamp box/guts to the cab, on/off, vol knob and Jack all nicely positioned somewhere accessible yet looks factory. Hard to find via Google so far.

  3. The whining is gone. Thanks a lot for sharing (and document the process).

  4. MANY thanks! This fixes it. Had my THR10C for a few days, loved it apart from the whine. I was starting to think this was a fault and did a search. Search confirmed it seemed to be a fault and getting it replaced could be fun depending on where you got it from (I’m in the UK).

    I was starting to get to get depressed. And then I found the link to this.

    You are a STAR! Fixed it in five minutes. Many thanks for taking the trouble.

    1. I’m so pleased the guide has helped you and others, Andrew. I went through a similar panic, and was stunned to find no solution online. All Googling met a brick wall. How frustrating! I knew then what I had to do.

  5. Thank you for providing the solution that can help those who got a dodgy THR.

  6. Excellent guide there Gray. This fault should never have made it into production and it’s even more surprising that Yamaha give customers who have the fault such a hard time getting it rectified. ALL THR’s with this problem should be replaced by Yamaha without question.

    Thanks for posting this guide. If you don’t mind I would like to post a link to it on our web site and forum?


    1. Of course, Saul, spread the word. The forum likely draws a lot of relevant visitors; I think I ended up there myself when searching for a fix! At least I learned I wasn’t alone.

      Yamaha is a hard company to be mad at, but this is a disappointing oversight. Hopefully those without access to warranty service (or who just want to avoid the hassle) can follow these steps and start really having fun with their THRs. Thanks for coming by.

  7. […] at any time. It's what Yamaha should have done before assembly. But it is, easier just to fix… THR Noise Fix Hope this helps out anyone who might experience the same, now or in the future. […]

  8. Thank you so much for the fix. I haven’t taken mine apart yet, but this is the exact same thing my 10X is doing. I owned both the 10 and 10C prior and neither had this issue.

    I was about to return the amp, when I finally stumbled onto this simple fix.

  9. Dude thank you so much. You saved me so much trouble with this simple solution to my issue. Bought my THR10C and tought I am realy unlucky for getting a broken piece, but as I searched i realised that its (unfortunatly) a common issue with these great amps. You are the only person to provide a resolution for our issue. Again, thank you so much, you rock!

  10. Great write up , solved problem for me . I had to unplug wide white plug that pre-amp wire unconnected to and up wrap it as it was twisted . One wire tie later and voila .

  11. […] can do it yourself… and I suppose void your warranty, if they find out. I Just did it any way. Yamaha THR10 Squealing Noise Fix | Pick Roar __________________ 2014 Gibson Les Paul Studio Pro 2013 Gibson SGJ 1985 Kramer Baretta – […]

  12. Yamaha have now taped the wire out the way on the latest models

  13. Thanks for the heads up on this fix , I was pretty much only getting the noise on the Hi Brit channel my favorite channel go figure. Had to move the wires around a bit but it`s fixed. Theres`s still a little white noise when I hit the strings on the Hi Brit channel but I think thats got to do with high gain nature of that channel

  14. Miguel Ferrao says: Reply

    Still pending with the fix, because had not time …
    But other thing that i notice is the lad o gain in the lead channel. Comparing with the demos that I saw. I am a bit sad and near to sell this “crap” …
    The noise could be fix, but the metalic sound and the low drive in the the lead and crunch.
    The Brit hi is ok … and the modern depends of the settings …

    Prob i got a bad unit, and because i live 1000 k from shop … i will try to upgrade to the V2, prob can fix this issues of the simulator.

    And I will try the fix. 🙂 … even if just for the fun 🙂

    Everything good for all. And keep rocking.
    PS:Sorry my English.

    1. You might have gotten a ‘lemon’, Miguel. I tried out the regular THR10 and thought it had a huge amount of gain on those settings. If you’re a high gain fan, maybe you can swap it for a THR10X anyway, which for me has better gain tones? Good luck!

  15. Thanks for the fix. I’m an ex amp tech so I was poking around trying to find the cause. Saved me lots of time.

    However, I only heard the whine when connected to my recording studio interface unit. Standalone its OK.

    Another issue I ran across. Using batteries and your fix the whine is gone (through my recording studio equipment) BUT using the AC adapter I still get a high pitched whine and some other white noise. Although this is not a “ground loop hum”, using either a ground loop hum eliminator such as the Ebtech Hum Eliminator or connecting a D.I. box, with the ground lifted, between the THR10 and the recording studio equipment eliminates the whine/noise.

  16. Thank you very much!

  17. Hi, just got an THR10 its amazing, but after the update to v2 firmware i noticed some strange (electric or static) noises when using the modern channel with effects (its not the same issue shown on the video). I tried with different guitar and cable, with headphone i can still hear the noise, but recorded via usb i can´t hear it. Does anyone had this same issue?

  18. Now that you have this problem kicked, have any of you tech guys figured a way to hardwire a preamp out jack for this lovely almost perfect unit. I would have everything I wanted if I could jack it directly into the PA as a preamp.
    Also.. Since I’m 1-click away from buying the std or C, has anyone used either with a harmonica? I used to have a Pignose DC amp (with preamp out jack) that I played thru to get “that sound” I liked. Wondering which would be best.
    I play acoustic blues, slide Delta blues, led Zeppelin III, Ron Wood, but open to new sounds. I feel the 10 may open new doors but I may like the 10C better. One forum guy bought both and plays in stereo. At $219 with free shipping on eBay, why not???
    Does the new V2 software improve or degrade the unit?

  19. I love you man. Thanks for posting this. Just bought a second hand THR10C today. Even asked the guy if he’d had any problems with humming (since the earlier models had some power transformer issues I’d read). No he said, all works fine! Apparently he’s less critical than me, cause I can’t stand high pitch noises, even if mine wasn’t nearly as loud as the one in the video.
    Plugged it in at home. seemed okay, but some slight high pitch hum, especially on higher gains. So glad I found your fix right away, saved me so much frustration!
    Found my wires exactly as in your picture. Fixed it exactly in the same way. Well I used a black cable tie. That also works 😉

  20. Gray,
    Thanks a lot ! It works now !
    Good job buddy !



  21. Great advice. My THR10 recently started buzzing/whistling. 10 mins and this has fixed it! Many thanks

  22. I have the same issue as Miguel. Almost no gain on the lead channel even though gain is max.

  23. This is unrelated, but when removing the cover, is it possible to easily access and remove that metal handle that sits atop the amp?

  24. Thanks a lot man!
    I thought the high pitched noise was because of the gain settings, but I’m SO glad that it wasn’t. Me and my girlfriend couldn’t stand the whining high-pitched noise. Indeed a five minute fix, thanks to you 🙂
    Greetings from another satisfied THR-10 owner!

  25. Really?! Yes, really.
    A zip tie, and that’s it. Perfect, thanks a lot, you rule.

  26. Thanks a lot. not even 5 min and i fixed it. Yeah…

  27. Thank you very much!!!

  28. Great simple solution. Work like a charm. I also made an additional shields to that wire. You’ve poked it at the exact itchy spot. Thanks so much.

  29. […] I decided to make one additional fix.  While researching this power plug issues, I ran across an article at pickroar.com. They report an interesting bug in the design of the […]

  30. Thanks alot
    I have gone thru your solution for fixing the high pitched ham.


  31. Grateful Reader says: Reply

    THANK YOU VERY MUCH! I bought one of these used about a year ago. I tried it all over my house, figured it was my wiring, and I never really played it. I dug it out today to put on Craigslist… then tried a Google search I should have done a year ago. A few minutes (and a zip-tie) later, and I am whine-free.

  32. Henk van Tilburg says: Reply

    Thanks allot, finaly fixed.

  33. Thank you so much, Gray. So grateful you took your time to share your solution with others.

  34. Olá a todos,

    o meu não faz ruído, mas o knob do Delay, quando o coloco a 0, fica sempre um pequeno Delay, já li vários useres na internet a queixar do mesmo, mas ão vi ainda nenhuma solução, neste momento encontrei este fórum e gostava de saber se tem conhecimento deste erro ou sabem como resolver? abraço

  35. Hi
    I also see a review with comparaison thr 10
    what did you choose))

  36. guys please be careful with the on off switch mine broke off,so i unsoldered it put in a new switch,which in turn fried it, so i had to buy the circuit board,with switch 177.00,,,,replaced it and the transformer blew so i had to buy the main circuit board another 145.00 grrrrrrrr,got it all together and the squael started,which i9s why im here ty for this bro,and be careful round ur on o0ff switch peace……

  37. Thanks again for posting this! Works like a charm.

  38. Man! I want the THR10X but seeing all those surface mount chips, resistors s and caps puts a very short and apparent life-span on this toaster. Diagnosing a real amp is relatively easy because the signal path is simple and follows a logical flow. When something pops on this you’ll probably have to swap boards till it works or toss it. I really love the tone of brown I and brown II models though.

  39. tried to use the amp’s AUX input to amplify my Helix pedalboard, but as soon as I plugged it in the whine started. Any ideas?

  40. Quentin Cooper says: Reply

    My whine wasn’t too bad but it had an annoying trailing reverb sound even when the reverb was turned down low, I did the cable tie fix and now it’s gone so thanks! Who would think that ‘poking around’ with a pencil could lead to a fix, genius stuff!

  41. Thanks for the fix! I found this some weeks ago and finally got around to doing it tonight. Solved the problem right away (now, it’s just the first night so hopefully it won’t come back, but sounds way better, no crazy noise).

    I thought I’d offer a few tips:
    (1) you only need to take out 5 screws plus the 4 hex screws (the silver ones on front). In the back you take off the 3 along the back seam and then there are 2 in the front “feet” of the unit. Then you open the case by gently lifting up the front flap. It flips up.
    (2) Be careful when you flip it up, there is no hinge. The only thing holding the two parts together are the speaker wires, so if it falls you could damage that. Do this on a table with a towel or something. I put mine on a thick cutting board so I could rest the silver handle on the table top behind the board to keep things lined up.
    (3) use really small zip ties, preferably the ones for electronics. I used 4″ (10 cm) mini cable ties. Make sure you use ones that DONT have the teeth on the first short section of the cable tie. Here’s why: the circuit board is fixed to the top of the unit so getting the tie around the board can be tricky. If your cable tie has a good section without teeth then you can bend it at a 90 degree angle to make it easy to slip around the wire and under the bottom of the circuit board so you could then grab it with needle nose pliers and pull it through. Also make sure to clip off the end as it will likely make closing the unit difficult (I clipped it, so I cant say for sure, but it appears it would be difficult).

    Good luck to other fixers out there! I am not Mr. Fixit and I was able to do this no problem. The hardest part was gently getting the cover off the unit.

  42. Hello! thanks for this tutorial,
    I’ve just bought two second hand THR10C units and the second one was doing this noise right from the start. as the first wasn’t, I suspected something was not normal. Lucky me I looked for « a constant noise troubleshooting » and immediately found your page. you saved me and made me feel like I could fix electronics which is a priceless feeling.
    thank you thank you thank you

  43. Ronaldo Silva says: Reply

    Solve my problem!!!!! Thanks a lot! Best Regards!

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