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Thread: HELP! - Speaker hissing under all conditions

  1. #1
    Tone Member waltschwarzkopf's Avatar
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    Default HELP! - Speaker hissing under all conditions

    Hi guys,

    I recently acquired a Phil Jones CUB II AG-150 BK amp in good condition. I had been looking for a two channel acoustic amp to us with my stick.

    The amp has many features and all seem to work fine, the only problem is the continuous hissing, not humming. (hissing = hiiiiiiiiiissssss, humming = hummmmmmmm)

    I tried it without any instruments plugged in, all knobs turned to 0, gains, volumes, master, everything and the hissing is still there.

    Any ideas of what the problem could be and how to get rid of it?

    Cheers,
    Walter
    "I don't want to be a product of my environment, I want my environment to be a product of me."

  2. #2
    Mojo's Minions Gtrjunior's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    How loud is the hissing?
    Does it make the amp unusable?

    I think with any amp 100% silent is unrealistic.

  3. #3
    Ultimate Tone Slacker Jacew's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    It shouldn't make noise volume down.

    Have you tried it in different house?
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    A Ficus ehdwuld's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Solid state?

    Aint the speaker

    Signal , probably some loose connection or solder joint , leaking through
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  5. #5
    Tone Member waltschwarzkopf's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Quote Originally Posted by Gtrjunior View Post
    How loud is the hissing?
    Does it make the amp unusable?

    I think with any amp 100% silent is unrealistic.
    Loud enough to be annoying, quite enough to be "unnoticeable" when you're playing.

    Quote Originally Posted by Jacew View Post
    It shouldn't make noise volume down.

    Have you tried it in different house?
    Yes, I knew about this when I bought it. Therefore the deal, 100 bucks for it. I hissed at the guy's house and hisses at mine. I tried also different cables and also by removing the center pin (ground) from the power outlet.

    Quote Originally Posted by ehdwuld View Post
    Solid state?

    Aint the speaker

    Signal , probably some loose connection or solder joint , leaking through
    I believe it is SS. I was gonna remove the speakers and check for loose connections, but I guess is not needed, right? Where should I check for a loose connection or solder joint?
    "I don't want to be a product of my environment, I want my environment to be a product of me."

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    A Ficus ehdwuld's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    If it hisses with the volume down
    I would think something around the output transformer has a bad solder joint
    The hiss is the small arc of power passing over the gap

    That would be where I'd start

    Oh wait
    Does it have an effects loop

    Jump that with a patch cable first
    EHD
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    Tone Member waltschwarzkopf's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Quote Originally Posted by ehdwuld View Post
    If it hisses with the volume down
    I would think something around the output transformer has a bad solder joint
    The hiss is the small arc of power passing over the gap

    That would be where I'd start

    Oh wait
    Does it have an effects loop

    Jump that with a patch cable first
    Good idea, although I tried it and it was still hissing. I guess I'll have to open it and and check the output section to see if there is any apparent problem.
    "I don't want to be a product of my environment, I want my environment to be a product of me."

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    Tone Member waltschwarzkopf's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Another thing. I tried using the headphones output and sound (guitar) comes out of the headphones and the speaker is muted (as it should). However, the hissing continues to com out through the speakers but no through the headphones.

    Are the speakers the problem? I can remove them and have a quick look if there is anything wrong there. Also, since the amp is SS, I could turn it on with the speakers disconnected, right? This way I can see if the hissing actually comes through them and not some other part.
    "I don't want to be a product of my environment, I want my environment to be a product of me."

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    A Ficus ehdwuld's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    I think the headphone uses a different tap on the output transformer
    EHD
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    Mojo's Minions dystrust's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Quote Originally Posted by ehdwuld View Post
    I think the headphone uses a different tap on the output transformer
    The amp is SS, so it probably doesn't have an output transformer.

    Like others have said, I seriously doubt that the speaker is the cause here. And I agree with ehdwuld that the source of the hiss appears to be after where the headphone signal is tapped off.
    Quote Originally Posted by crusty philtrum View Post
    And that's probably because most people with electric guitars seem more interested in their own performance rather than the effect on the listener ... in fact i don't think many people who own electric guitars even give a poop about the effect on a listener. Which is why many people play electric guitars but very very few of them are actually musicians.

  11. #11
    Ultimate Tone Slacker Jacew's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Just a wild stab, but is the speaker grounded?
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  12. #12
    Tone Member waltschwarzkopf's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Quote Originally Posted by Jacew View Post
    Just a wild stab, but is the speaker grounded?
    What do you mean by this?

    The amp is grounded, as I'm using a three-pin plug to the power outlet. I can open the amp and remove the speakers to check them further, but what do I check exactly?
    "I don't want to be a product of my environment, I want my environment to be a product of me."

  13. #13
    Ultimate Tone Slacker Jacew's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Quote Originally Posted by waltschwarzkopf View Post
    What do you mean by this?

    The amp is grounded, as I'm using a three-pin plug to the power outlet. I can open the amp and remove the speakers to check them further, but what do I check exactly?
    My Fender Mustang combo had a ground wire on speaker chassis to connect it to the amp chassis. I think it did made a slight hiss without it when I tried.
    "So understand/Don't waste your time always searching for those wasted years/Face up, make your stand/And realize you're living in the golden years"
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  14. #14
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    Default Re: HELP! - Speaker hissing under all conditions

    Phil Jones equipment has some pretty unique amp/speaker configs.. I suggest contacting Phil Jones, as if there ever was a company doing weird things -it's them.
    “For me, when everything goes wrong – that’s when adventure starts.” Yvonne Chouinard

  15. #15
    Tone Member waltschwarzkopf's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Ok! I’ll constant Phil Jones about the issue, seems like the first thing to do. In the meantime, I’ll have a quick look at the speakers and give it and try with the grounding.


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  16. #16
    Tone Member waltschwarzkopf's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Quote Originally Posted by Jacew View Post
    My Fender Mustang combo had a ground wire on speaker chassis to connect it to the amp chassis. I think it did made a slight hiss without it when I tried.
    I removed the speakers, and I have to say that those were the finest connections I've seen in any amp!

    There was no ground to the speaker chassis, but also no way to do it, the whole cavity was made of solid wood and also filled with some woolly type of thing. I don't think they "forgot" the ground wire, there were only the + and - wires for each speaker.
    Last edited by waltschwarzkopf; 05-25-2019 at 02:48 PM.
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  17. #17
    Tone Member waltschwarzkopf's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    I tried again with headphones and the hiss becomes apparent if I crank up the volume, although I would never use it like this. Still, makes me think that he problem is not in the speaker, but somewhere else.
    "I don't want to be a product of my environment, I want my environment to be a product of me."

  18. #18
    A Ficus ehdwuld's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Ain't the speaker
    There is no ground on any of my speakers

    It may be a ribbon cable inside
    EHD
    Just here surfing Guitar Pron
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    Mojo's Minions beaubrummels's Avatar
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    Default HELP! - Speaker hissing under all conditions

    Do you have the limiter on? Try turning that off or turn it to 0. Otherwise, it could be that amp has some bad components in the output power section. It’s not speaker related. Hiss when volumes are down comes from the power section.
    Last edited by beaubrummels; 05-26-2019 at 10:09 AM.
    Quote Originally Posted by Demanic
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    Quote Originally Posted by GuitarFanatic
    I am currently using Skullcandy headphones I found in the garbage.
    I did find the DS-1 in the garbage.
    I once found a guitar amp in the garbage, a Peavey Studio 110. It caught fire at the first gig I played it at.. But it was at the end of it, thank god.

  20. #20
    Tone Member waltschwarzkopf's Avatar
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    Default Re: HELP! - Speaker hissing under all conditions

    Ok, then I’ll have a look at the output section. Should I look for anything in particular?

    Glad to know that the speakers are not the problem. Although there was no hissing when the speakers were disconnected, I understand the hissing happens because some unwanted signal is coming from the output, right?


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