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Post by Van on Jun 17, 2005 22:21:40 GMT -5
Scanning these threads, it seems all the talk is of tonal changes effected by Jerry P when he mods people's amps.
I'm actually plenty happy already with my JSX's tones. Sure, I'd somehow like to incorporate a fourth "Legacy" channel into this amp in order to get those mids rich Legacy lead tones, but I'm good with what the JSX already has on tap for lead tones...
What I would like though is to see a drastic reduction in hum and white noise hiss on the really noisy Ultra channel...
Run that thing's Gain above the half way point and the extra hiss is just way too much. Sure, the noise gate does a good job of knocking down the hum and my ISP Decimator takes care of the rest of the white noise hiss. Problem there is that in order for the Decimator to completely knock down the hiss I have to run it with enough noise suppression that it then won't allow those in between tones, those "roll off the guitar's volume to clean things up" tones...
Too much clipping and burping and all that as the noise suppressor struggles with deciding what to let through and what to knock down...
So, is there a way to at least retain (if not improve) the stock Lead tones and stock amounts of gain (I don't want any reductions in gain) while knocking that extraneous noise down on the Ultra channel to where it's as quiet as the Amber channel?
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Post by Jerry P on Jun 25, 2005 20:26:38 GMT -5
The circuit on the JSX is more of a noise reduction circuit than a noise gate. It doesn't gate the signal and chop it right off like a noise gate will. It's designed to just remove the annoying noises like the hiss. A hum could be the sign of a tube problem or a failed screen grid resistor. The hiss noise comes with the territory of a high gain amp. Unfortunately, you don't get something for nothing.
Jerry
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Post by Van on Jun 25, 2005 21:09:48 GMT -5
So, there's no way to at least reduce the white noise on the JSX's Ultra channel, even though it really does have more white noise than most any other high gain amp I've played?
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Post by Jerry P on Jun 25, 2005 21:32:56 GMT -5
So, there's no way to at least reduce the white noise on the JSX's Ultra channel, even though it really does have more white noise than most any other high gain amp I've played? I can't say what's causing your noise without having the amp here. If might be normal, it might have a problem. You could try swapping some tubes if you have any around and see if that changes anything. Where do you have the ultra channel gain set? I've always found most of the JSX/XXX amps I've had here to be pretty quiet. Jerry |
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Post by Van on Jun 26, 2005 11:08:12 GMT -5
It's a brand new amp. According to the serial # Peavey says it was built in April of 2005.
The stock power tubes are JJ's EL34's, though I've also tried some Ruby's Shuguang EL34BSTR's, with both sets biased to 36ma.
It came stock with EH pre's in V1-V3 with a Sovtek in V4. I've tried all sorts of different pre's, from the new JJ's ECC803's to NOS JAN Phillips 12AX7's to JJ's ECC83S's.
With the exception of the 803's (which are lower gain and much quieter) all the other tubes (power and pre) produce the same amount of white noise hiss; ie, not much on the first two channels, quite a bit on the third channel.
I usually set the Gain on the Ultra channel to 6, along with the Presence and Treble. The Mids are at 5 and the Bass and Resonance are at 7 and the Fat switch is on. I'm running the head through a Legacy 4x12 with V30's.
The amp is in perfect working order. It sounds the same as the other five JSX's I've played, with the same amount of white noise hiss on the Ultra channel. The only difference is mine is a very recent model so it includes the screen grid resistor and noise gate upgrades from Peavey.
My amp's Ultra channel feeds back less than the earlier JSX models and its noise gate seems to be more effective too.
Jerry, when the JSX is working normally do you at least notice a marked increase in the white noise hiss when you switch from the Amber channel to the Ultra channel?
I sure have, on every JSX I've tried. I don't think my amp is malfunctioning in any way. I think it's doing the same thing all JSX's do and I was just hoping there was a way to reduce that third channel white noise hiss without also reducing the amount of available gain and/or changing the tone...
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Post by Jerry P on Jun 26, 2005 15:53:29 GMT -5
To be honest I'm so used to the hiss of the 5150 lead channel that anything else I hear sounds quiet in comparison. I've pretty much just accepted that it comes with the territory and I'm going to have to deal with it.
Have you asked Roger on the Peavey forum about it? In all the JSX and XXX amps I've played I never heard anything I considered excessive. If the amp has a problem and it's under warranty I'm sure Peavey will make it right.
It's hard for me to say if yours is excessive without actually hearing it. I take your word for it.
Jerry
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Post by Van on Jun 26, 2005 22:36:41 GMT -5
Maybe it's not excessive, at least in terms of it being any worse than other JSX's.
I'm guessing it's not, and that just like have, people simply get used to it.
Oh well, I was just hoping your answer would be something along the lines of, "Oh, the JSX white noise hiss? Hell yeah I have a simple fix for it, and my fix also punches up the bottom end a bit too! When I'm done with your JSX it'll be so quiet and ballsy you'll wanna bear my chillins'!"
Guess not...
:-)
Thanks anyway though. Like I said, I can live with it as is, with the only issue being its inability to clean up when I roll the guitar volume back due to my Noise Suppressor clamping down hard enough to cover the usual white noise...
Also, hey, the V3 is supposed to finally show up in the next Carvin catalogue and that one may well be the one...
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Post by Van on Jun 26, 2005 22:39:54 GMT -5
In that last post it should've read, "...and that just like ~you~ have, people simply get used to it."
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Post by Jerry P on Jun 27, 2005 9:52:44 GMT -5
HAHAHAHA I can make it quieter and tighten up the bottom end. To make it quieter would require knocking the gain down a little. Nothing too crazy, just enough to calm down the noise. If you're running the gain at 1 o'clock or less you've got plenty to spare.
Jerry
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Post by chumbucket on Jul 8, 2005 7:46:00 GMT -5
I was shocked by how little noise the JSX has at high gain levels. I think it's probably the quietest high gain amp I've ever tried in that respect. I just did an A-B with a few other amps the other night and I had to double check at one point to see if I had taken the JSX off of standby.
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