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> Amp Hissing, Eganter Rebel 30
post Jul 26 2014, 10:31 AM
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I have a problem with my Egnater Rebel30 and I don´t know if this is a normal behavior.

I didn´t connect a guitar cable on the amp to hear only the noise of the amp.

Here is the Clean Channel:
Attached File  clean.mp3 ( 496.45K ) Number of downloads: 137

Volume: 0
Attached File  clean_0.mp3 ( 104.11K ) Number of downloads: 130

Volume: 9
Attached File  clean_9.mp3 ( 105.13K ) Number of downloads: 120

Volume: 12
Attached File  clean_12.mp3 ( 105.64K ) Number of downloads: 116

Volume: 15
Attached File  clean_15.mp3 ( 106.66K ) Number of downloads: 116

Volume: full open
Attached File  clean_voll.mp3 ( 112.27K ) Number of downloads: 121

Here is the Distortion Channel
Attached File  dist.mp3 ( 405.13K ) Number of downloads: 140

Volume: 9
Attached File  dist_9.mp3 ( 101.55K ) Number of downloads: 116

Volume: 12
Attached File  dist_12.mp3 ( 99K ) Number of downloads: 105

Volume: 15
Attached File  dist_15.mp3 ( 106.15K ) Number of downloads: 127

Volume: full open
Attached File  dist_voll.mp3 ( 116.86K ) Number of downloads: 134

I really love the amp, but this is annoying.
You can´t use this amp for recording, you always have this annoying hissing in the Background

How can I fix this Problem ?

Many Thanks

This post has been edited by Frankster: Jul 26 2014, 10:31 AM
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post Jul 26 2014, 04:07 PM
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How old is it?
When was it serviced last?

Could be a cap or resistor going bad.
*Possibly a bad tube although that's usually a different noise.

This post has been edited by klasaine: Jul 26 2014, 04:08 PM

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Gabriel Leopardi
post Jul 26 2014, 06:05 PM
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That noise is saying that your amp needs a service. I have no experience with technical and electrical issues so I can't help you but I can say every time I have a problem like this one I send my gear to the technician. Do you have a technician in who you can trust?

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post Jul 26 2014, 08:04 PM
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A little low level hiss on tube amps is fine and normal - when your actually playing it shouldn't sound out.

Your clean channel will actually softly hiss a little under volume:
"The clean channel is just a hotter channel due to its gain structure. You can try different preamp tubes in the V2 location this may help some."

However, when a tube amp really starts to hiss loudly, uncontrolled or volume raises/lowers suddenly, then it's might be time to replace/bias one or more of the tubes.

I've question my own tube amp myself and therefore made me some previous notes, which should help you too.

Common signs that tubes need replacement:
1) Excessive hissing or humming noise which gets worst over time
2) Squealing or micro-phonic tubes
3) Loss of high end.
4) Little or no treble.
5) A muddy bottom end; Sounds like there is too much bass and note clarity is lost.
6) Erratic changes in the overall volume. Can go up and down but generally it goes much lower.
7) A blown high tension fuse.

Consider them just like your guitar strings (however they should last a long while). The more often you play and the more aggressive you play, the faster the tubes/strings will wear out. Playing loud and hard will cause your tubes to lose power and tone long before they finally die. This wear down process is very gradual and most people wouldn’t recognize the difference in tone until new tubes were put in and biased by an authorized technician.

Firstly if you want to check -

1) Got a can of compressed air? Unplug and spray all the connection ports of your amp, just ensure there's no dust around.

2) Warm up the pre-amp for a while before actually taking it off standby. The tubes will sound their best when running warm.

3) Remove all effect loops and cables from the amp. Hissing should lightly a little bit, but if it's a lot then it might be a device on your chain, a certain cable or the guitar pups, etc.

4) There's a way to test each tube while it's on and been warmed up, if your careful, by lightly tapping them with the un-pointed end of a soft pencil. If there's a loud ringing or crackling sound, then that's your problem tube! They will all ring to a certain degree but the “bad” one will be much more noticeable.

5) If a power tube goes, you should replace all of them so they will have equal wear over time. This will help provide a more even fuller and richer tone.

Hope that helps!
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Todd Simpson
post Jul 26 2014, 10:19 PM
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Now THAT is a fine post!! I hope that one goes in the wiki!! It covers everything one you look for when an amp starts acting funny smile.gif Nice on AZZA!

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