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Topic: Hissy amp |
C E Holden
From:
Austin, TX
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Posted 26 Dec 2013 9:46 am |
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Hi Folks,
I've got a Yamaha G100-112 amp, and I've got it dialed in where it sounds pretty durn good, tone-wise. However...
This thing hisses louder than a mad cat. The hiss is in the front-end, and gets exponentially worse when the "bright" circuit is engaged. It may just be the nature of the beast (a la Roland JC-120), but was wondering if any of you electronics gurus could shed some light. Thinking it just has noisy FETs, but would replacing them and/or a cap job help to quell the cobra?
Thanks,
Craig
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"il brutto" |
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Dave Grafe
From:
Hudson River Valley NY
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Posted 26 Dec 2013 10:43 am
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| Are you using the effects loop for outboard processing? |
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Brad Sarno
From:
St. Louis, MO USA
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Posted 26 Dec 2013 11:40 am
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Does the hiss go away if nothing is plugged into the input to the amp?
No change? JFET's can go hissy. Not likely capacitors, they go hummy or sound sluggish, but not hissy.
B |
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C E Holden
From:
Austin, TX
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Posted 26 Dec 2013 2:00 pm
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Dave-- not using the effects loop; it doesn't have one. It has a line-level output, but no return.
Brad-- noise goes away when input is unplugged! I had no idea my rack made that much white noise! Geez... I don't hear all that when it's plugged into my Twin...
Y'all please enlighten me.
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"il brutto" |
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Stephen Cowell
From:
Round Rock, Texas, USA
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Posted 26 Dec 2013 8:22 pm
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Your rack equipment wants +10dbM... when you plug your guitar straight in, you have a big difference there. This leaves your signal down in the dirt all the way through the rack boxes... the amp just amplifies both the signal and the dirt.
Chances are that your amp could have a real loop put into it... you've already got one of the jacks, you just need the preamp output to make it right. See a tech about that... or think about another amp. Your system is incompatible with itself!
Also: make sure there's not a 'low level' switch on your rack stuff that you can flip to make it input compatible; I know some equipment can do this.
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Too much junk to list... always getting more. |
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Brad Sarno
From:
St. Louis, MO USA
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Posted 26 Dec 2013 8:43 pm
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C.E., can you tell us what your rack setup consists of?
Brad |
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C E Holden
From:
Austin, TX
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Posted 26 Dec 2013 10:57 pm
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Here's the chain:
Guitar
Goodrich Matchbox
Peterson Strobo-Rack
BK Butler RealTube (bypass on)
Volume pedal (passive)
TC Electronics M300 (reverb & delay)
Amp
I'm thinking it must be the TC-M300 since my volume pedal seems to have no effect on the hiss level. I think I have enough gain running through the chain.
I dunno. I guess I'll just pull stuff out of the chain working backwards until the signal cleans up. It's not an issue with my main amp anyway; I never even noticed the trash until I plugged into this Yamaha....which is why I thought it was the amp.
In any case, "Man, that guy is a real Buddy Emmons...too bad his amp is so noisy," said no one ever.
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"il brutto" |
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Brad Sarno
From:
St. Louis, MO USA
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Posted 27 Dec 2013 7:42 am
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Indeed.
The TC M300 is a line-level device. You are feeding it a guitar signal level that's WELL below the line level it expects to see. Your guitar signal is getting buried deep into its hissy noise floor, and when you finally reach the amp, that noise is naturally going to be very loud. You should consider an effects pedal or 2 that are designed for guitar signal levels instead. Also the Butler Real Tube may also be contributing some noise, even bypassed. But the TC M300 is mostly likely the source of all the audible hiss.
Or, there are some rack effect units that are designed to see guitar level instead. That would be another solution. Consider what effects you actually need. I'm guessing reverb and delay primarily.
Brad |
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C E Holden
From:
Austin, TX
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Posted 28 Dec 2013 1:32 pm
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Welp, color me dumb. I figured the TC was instrument level.
Thanks for the help, fellas!
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"il brutto" |
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