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Post subject: Fender Hot Rod Deluxe Mark 3 - noises coming from amp
Posted: Mon Feb 20, 2012 5:07 am
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Joined: Mon Feb 20, 2012 5:02 am
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Hi

after a recent gig, the next day i noticed that the amp makes a funny kind of drilling noise like "bup-bup-bup-bup-bup" at times. is ok when playing loud as i cant hear it but when quiet it is quite prominent and will need to get it fixed for the next gig. the noise also comes on even if the guitar isnt connected to it, so it must be the amp and not my pedals/guitar.

was just wondering if any had any ideas on this, have came across it and how to fix it?

thanks
Colin


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Post subject: Re: Fender Hot Rod Deluxe Mark 3 - noises coming from amp
Posted: Mon Feb 20, 2012 6:27 am
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Rock Star
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Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
Sounds like you got the infamous "motorboat syndrome." First thing to do is remove the tubes, use some contact cleaner, & replace them. Same problem, still? Try replacing the tubes from one 12AX7 position and 6L6GC position to another similar position. See if the noise changes or goes away. This way you can isolate a problem tube.

Still no luck? You could need new power supply filter caps. Prolly best left for a good tech.

Good luck!


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Post subject: Re: Fender Hot Rod Deluxe Mark 3 - noises coming from amp
Posted: Mon Feb 20, 2012 8:36 am
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Professional Musician
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Location: South Bay, CA
If this is a new amp, I'd take it back to the dealer assuming it's still under warranty if swapping the tubes doesn't correct the problem.

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Post subject: Re: Fender Hot Rod Deluxe Mark 3 - noises coming from amp
Posted: Tue Feb 21, 2012 8:02 am
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thanks guys. will give that a go!!


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