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Thread: Getting a "whistle" from my amp???

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    my banana hammock hosts a leetle peppercini and has hit the skids Aceman's Avatar
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    Default Getting a "whistle" from my amp???

    Here is the situation:

    Amp - Mesa Stiletto. Whistle is only on high gain channel.

    Guitar straight in is fine. Only the normal "hiss" associated with epic gain.

    However - I get a hum/whistle noise as soon as I go into any effect. Chain is:

    Guitar > EHX Pitchfork > EHX Synth9 > Morley Wah

    I thought this was due to a mega-junction box at last gig. But it is now in my music room! I have tried into only pitch, only Synth, and only Wah. I get less with the Wah than the other two, but I get it with all. What's up???
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    Mojo's Minions
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    Default Re: Getting a "whistle" from my amp???

    Whistle is most often preamp tube issue. swap the channel tubes and see if it follows.
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    Mojo's Minions Gtrjunior's Avatar
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    Default Getting a "whistle" from my amp???

    Just speculating but if any of those pedals are digital you may need to put them on their own power supply. I was using the Digitech drop a while back and it caused a digital whistling until I used a separate power supply.

    But since you get it regardless, I’d try the preamp tube swap first.

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    tonewood instigator
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    Default Re: Getting a "whistle" from my amp???

    Take it as a compliment and move on.
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    Super Toneologist Hsb's Avatar
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    Default Re: Getting a "whistle" from my amp???

    I saw something today in the comments of an EHX pedal, that EHX 9 pedals need to be on their own power supply or isolated power, if they are daisy chained you will get noise.

    Couldnt find the video I saw it on but whomever the EHX person was in the video made a comment when someone in mentioned they were getting a noise. The EHX rep stated the above.

    I did find a comment in the official EHX review of the Turnip Greens pedal. Someone stated thwy were getting a whistle when playing the pedal. EHX again stated the same about the power suplly
    Last edited by Hsb; 11-09-2019 at 05:50 PM.
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    Default Re: Getting a "whistle" from my amp???

    I’d be inclined to believe either the preamp tube theory or the power supply theory.

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    Administrator Mincer's Avatar
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    Default Re: Getting a "whistle" from my amp???

    Does it whistle when the effects are connected, but off?
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    Underglazed Hair Metalologist 80's_Metal's Avatar
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    Default Re: Getting a "whistle" from my amp???

    Jam your Jack in and out of the holes a few times especially the effects loop.... If that doesn't work, I'd suspect tubes.

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    my banana hammock hosts a leetle peppercini and has hit the skids Aceman's Avatar
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    Default Re: Getting a "whistle" from my amp???

    I do have all of these on a single 8 outlet Onespot....I can mess with the power situation easily.

    Like I said guys - Guitar straight into amp, with Zoom in FX loop = quiet.

    Is there a power toy that might help here?
    Quote Originally Posted by Bad City
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    Ultimate Tone Slacker Jacew's Avatar
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    Default Re: Getting a "whistle" from my amp???

    Quote Originally Posted by Aceman View Post
    I do have all of these on a single 8 outlet Onespot....I can mess with the power situation easily.

    Like I said guys - Guitar straight into amp, with Zoom in FX loop = quiet.

    Is there a power toy that might help here?
    You mean the daisy-chain type one-spot?

    For me it's been pretty much 50/50 chance of hiss or other weird effects when daisy chaining pedals. I vote for power issue.

    Try if using separate adapters fixes the issue. Doesn't EHX usually ship with original adapter?
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    Super Toneologist VinceT's Avatar
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    Default Re: Getting a "whistle" from my amp???

    Yeah, that sounds like digital pedal dumping high frequencies into the signal. Try each pedal on its own supply and see which one is the culprit.


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    Super Toneologist Hsb's Avatar
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    Default Re: Getting a "whistle" from my amp???

    Get a stand alone EHX power supply, bet problem goes away
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    Mojo's Minions
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    Default Re: Getting a "whistle" from my amp???

    Quote Originally Posted by Aceman View Post
    I do have all of these on a single 8 outlet Onespot....I can mess with the power situation easily.

    Like I said guys - Guitar straight into amp, with Zoom in FX loop = quiet.

    Is there a power toy that might help here?
    Oh yeah, digital fx pedals on a power daisy chain can definitely produce a pinny whine. And the analog ODs will exaggerate it.

    But a true "whistle" like a boiling kettle is almost certainly a tube in my experience.
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    Mojo's Minions devastone's Avatar
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    Default Re: Getting a "whistle" from my amp???

    Since it only does it when the EHX pedals are plugged in, I would try giving them their own supplies, the wah is kind of an outlier though.

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    Administrator Mincer's Avatar
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    Default Re: Getting a "whistle" from my amp???

    Try batteries, 1 effect at a time. I've never had an issue like this with the One Spot, but others have the exact issue you are describing.
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    my banana hammock hosts a leetle peppercini and has hit the skids Aceman's Avatar
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    Default Re: Getting a "whistle" from my amp???

    And the second I unplugged my Zoom multi-fx from the power chain - silence!
    Quote Originally Posted by Bad City
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    Administrator Mincer's Avatar
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    Default Re: Getting a "whistle" from my amp???

    Yeah, it isn't playing well. If you just use the Zoom, is it silent?
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    Mojo's Minions devastone's Avatar
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    Default Re: Getting a "whistle" from my amp???

    It's a grounding issue, lots of amps don't like it when effects in the loop share a power supply with effects in front. It seems like it shouldn't matter with a common ground, but it does, I think it's more from the effects than the amp.

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    A Ficus ehdwuld's Avatar
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    Default Re: Getting a "whistle" from my amp???

    Zoom pedals are finicky beasts
    I wont have one
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    Mojo's Minions beaubrummels's Avatar
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    Default Re: Getting a "whistle" from my amp???

    Quote Originally Posted by Aceman View Post
    I do have all of these on a single 8 outlet Onespot....I can mess with the power situation easily.

    Like I said guys - Guitar straight into amp, with Zoom in FX loop = quiet.

    Is there a power toy that might help here?
    I use an MXR ISO-brick for that problem.

    But these days I too use a Zoom, but as my complete pedalboard with nothing else. One outlet. Less problems.
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