HELP! - Speaker hissing under all conditions

[beaubrummels]

Re: HELP! - Speaker hissing under all conditions

If it isn’t the limiter, I think it’s going to need service/repair, or live with it.

There’s one last check - if you turn the treble down, is the hiss the same? (That would confirm it’s in the output section)

[waltschwarzkopf]

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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[beaubrummels]

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.

[ehdwuld]

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

[waltschwarzkopf]

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.

[waltschwarzkopf]

Re: HELP! - Speaker hissing under all conditions

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.

[waltschwarzkopf]

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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[NegativeEase]

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.

[Jacew]

Re: HELP! - Speaker hissing under all conditions

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.

[waltschwarzkopf]

Re: HELP! - Speaker hissing under all conditions

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?

[Jacew]

Re: HELP! - Speaker hissing under all conditions

Just a wild stab, but is the speaker grounded?

[dystrust]

Re: HELP! - Speaker hissing under all conditions

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.

[ehdwuld]

Re: HELP! - Speaker hissing under all conditions

I think the headphone uses a different tap on the output transformer

[waltschwarzkopf]

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.

[waltschwarzkopf]

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

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.