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60 Cycle Hum in some Helix amp models not others


Williamlavon
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My Helix is getting what sounds like 60 cycle hum with some amp models, (US Small Tweed, US Deluxe, Fullertons) but not others.

The noise occurs even with nothing plugged into the input. It can be heard thru the 1/4" outputs or thru the headphones.

I've tried different cables, ground lifts, etc. but that's not the problem. 

The US Small Tweed is the worst. The hum gets louder when the Ch Vol is turned up but the drive level has no effect on the noise level.

Other models are dead quiet: US Double, Jazz Rivet 120,Cali IV, etc.

 

Strangely the Grammatico Jump also has a hum but it's about an octave lower than the other amps. Weird.

 

Has anybody else had this problem? Do you have a solution?

 

Thanks

Edited by Williamlavon
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There is a hum parameter as part of most of the power amps, it might need turning down.

It struck me as weird at first because I'm in the UK and I am used to 50Hz hum.

 

I don't know if it's relevant but in a tube amp, power supply hum will be 2x line current frequency (100/120Hz) whereas ground hum will be 50/60Hz.

 

Craig

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Problem Solved!

 

Thanks Craig for pointing me in the right direction.

Turning down the HUM control didn't fix it.

Turning down the Ripple made the hum go away!

Further experiments reveal that the HUM control will bring in a low octave hum

and the Ripple brings in a buzz like a bad connection.

It effects some amps more than others.

It may be authentic but who really wants buzz and hum in their sound?

Thanks again Craig.

Bill

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That makes sense, power supply noise is referred to as ripple but I didn't realise there were separate Hum and Ripple controls. I guess it depends on what the original amps were susceptible to.

 

But you're right, who wants buzz and hum?, especially when they're the wrong frequency :-)

 

Craig

 

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35 minutes ago, Williamlavon said:

It may be authentic but who really wants buzz and hum in their sound?

 

The magic of a tube amp is all of it's imperfections. If L6 didn't provide these options, there would be people complaining the amp wasn't noisy enough :)

 

I'm with you.... just remove it completely.

But... it is 1 (of many) imperfections people think they need.

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  • 1 month later...
On 10/8/2019 at 2:32 PM, Williamlavon said:

Problem Solved!

 

Thanks Craig for pointing me in the right direction.

Turning down the HUM control didn't fix it.

Turning down the Ripple made the hum go away!

Further experiments reveal that the HUM control will bring in a low octave hum

and the Ripple brings in a buzz like a bad connection.

It effects some amps more than others.

It may be authentic but who really wants buzz and hum in their sound?

Thanks again Craig.

Bill

 

Absolute genius, thank you! I ran into this same issue last night. Loud hum outta my amp cab. Turns out that Helix did have a recent update, as my dad told me. Must have updated it some days ago. Hum does not fix as you said. Turning down (or off even) Ripple was like magic! ♥. Many thanks again. I hope this solution works for everyone else. 

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On 10/8/2019 at 8:46 AM, Williamlavon said:

My Helix is getting what sounds like 60 cycle hum with some amp models, (US Small Tweed, US Deluxe, Fullertons) but not others.

The noise occurs even with nothing plugged into the input. It can be heard thru the 1/4" outputs or thru the headphones.

I've tried different cables, ground lifts, etc. but that's not the problem. 

The US Small Tweed is the worst. The hum gets louder when the Ch Vol is turned up but the drive level has no effect on the noise level.

Other models are dead quiet: US Double, Jazz Rivet 120,Cali IV, etc.

 

Strangely the Grammatico Jump also has a hum but it's about an octave lower than the other amps. Weird.

 

Has anybody else had this problem? Do you have a solution?

 

Thanks

Hey, quit copying my thread! lolol.

 

Seriously though, we're just noticing this now?  Seems a little odd.  i just cannot recall ever hearing this hum prior to 2.82.

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This is one of those "groundhog day" discussions.

As I understand it, the idea of modeling is to create an accurate model of a real world amp.

If the real world amp hums, then an accurate model of that amp will hum.

They aren't modeling the hum, the hum is a result of the model being an accurate model of the original amp, which hums.

If you take the hum out, it has to change something about the way the amp sounds and, therefore, it is no longer an accurate model.

If you provide the user with controls which modify the amp model to remove the hum (hum/ripple), the argument then becomes "but it doesn't sound like the real amp when you do that!"

 

DOH!

 

SHUT UP AND PLAY YER GUITAR! (but not on my lawn!)

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54 minutes ago, hideout said:

Meh. I don’t give a rat’s patootie about that kind of accuracy. 

 

Nor do I.

I don't care about groundhogs either, as long as they stay off my lawn!

I actually like the L6 originals just fine. They're TOTALLY accurate, too!

Hum and all.....

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