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Old 10-02-2012, 07:59 PM   #1
XxJUSTJACKxX
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Krank Rev plus effects loop help

I have a Krank Rev plus head. I'm trying to use an ISP Decimator in the effects loop to get rid of the "hiss" from the gain channel. It has an active effects loop (Is that another word for a parallel effects loop?) I'm only question that I really need answered is how do I need to run it, when I run it it seems to drop the volume drastically, and when I turn it up past 4ish, it gets this extremely annoying hum in the background. I've tested my outlets and they are all working properly with no floating ground or any issues with the ground.

The amp's effects loop has the send and return jacks (obviously) an effects level knob and a "boost" switch, how do I run it so my Decimator will work like how its suppose to?

Gear:
1994 Jackson JRR Randy Rhoads Concept model with a Seymour Duncan Invader in the bridge.
Boss SD-1 and a ISP Decimator
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Old 10-03-2012, 07:00 PM   #2
311ZOSOVHJH
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free bump day



is there anything else in the loop
is the ISP on a power supply
is that power supply separate from amp outlet
is there anything in front of the amp
is there any difference in hiss when you swap preamp tubes
is there any way to plug your rig in a different outlet/house preferably
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Old 10-03-2012, 10:11 PM   #3
XxJUSTJACKxX
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Originally Posted by 311ZOSOVHJH
free bump day



is there anything else in the loop
is the ISP on a power supply
is that power supply separate from amp outlet
is there anything in front of the amp
is there any difference in hiss when you swap preamp tubes
is there any way to plug your rig in a different outlet/house preferably


There's nothing else in the effects loop.
The ISP is on a daisy chain with 2 other pedals (not in the loop)
The power supply is on the same outlet as the amp (which may be the problem)
I was using a Boss SD-1 (for a boost on solos, not on all the time) and a Boss TU-3
I don't want to mess with the preamp tubes for the sake of me probably screwing it up if I do.
Today I jammed with my bassist outside (using outside outlets but only using the amps) and allof the noise I heard was the gains his, which wasn't horrible, but not something I want.
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Old 10-03-2012, 10:53 PM   #4
R45VT
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Did you try it out front?

You typically run in the effects loop to kill noise from pedals in the loop.

Try guitar>ISP>amp.
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Old 10-03-2012, 10:55 PM   #5
XxJUSTJACKxX
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Originally Posted by R45VT
Did you try it out front?

You typically run in the effects loop to kill noise from pedals in the loop.

Try guitar>ISP>amp.


I'm not trying to use it to get rid of feedback, I'm just trying to get rid of the "hiss" from the preamp.
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Old 10-03-2012, 10:57 PM   #6
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Originally Posted by XxJUSTJACKxX
I'm not trying to use it to get rid of feedback, I'm just trying to get rid of the "hiss" from the preamp.


You didn't answer my question. I've used them up front to kill noise on the gain channel. Less noise going in= less noise going out.

Try Guitar>ODpedal>ISP>amp

and the ISP is not used to get rid of feedback.
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Old 10-03-2012, 11:12 PM   #7
XxJUSTJACKxX
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Originally Posted by R45VT
You didn't answer my question. I've used them up front to kill noise on the gain channel. Less noise going in= less noise going out.

Try Guitar>ODpedal>ISP>amp

and the ISP is not used to get rid of feedback.


Ok, well I haven't tried it, I'll test it out tomorrow and tell about my results.
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Old 10-03-2012, 11:28 PM   #8
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Quote:
Originally Posted by R45VT
You didn't answer my question. I've used them up front to kill noise on the gain channel. Less noise going in= less noise going out.

Try Guitar>ODpedal>ISP>amp

and the ISP is not used to get rid of feedback.

This is a good point.

Did you buy an ISP because of too much hiss in the amp? If that is the case, then I'd focus on getting rid of the hiss vs. trying to hide it.

Also, I may have falsely assumed it was not your guitar or OD pedals causing the hiss and that it is truly the amp. It is possible these are just hissy amps.

Additionally, I didn't fully understand what you were saying about when you guys went outside. Was there hiss out there on your amp?

PS: You won't hurt anything by swapping the preamp tubes around. How many are in there? Hit the pins with some contact cleaner and swap V1 and V2 around. I doubt that is causing hiss but it is still a good exercise.
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Old 10-03-2012, 11:31 PM   #9
R45VT
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I want to know does the amp make the noise with the guitar unplugged in the gain channel?
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Old 10-04-2012, 12:08 AM   #10
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Originally Posted by R45VT
I want to know does the amp make the noise with the guitar unplugged in the gain channel?


The gain channel still makes a hissing noise when the gain channel in on but the guitar volume is off (could be because I didn't do a great job soldering in the pickups) and the pickups are open coil humbuckers so they seems to be noisier than lets say EMG's
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Old 10-04-2012, 12:13 AM   #11
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can you record said noise?

what happens when you plug said guitar into a different amp?
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Old 10-04-2012, 12:15 AM   #12
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Originally Posted by 311ZOSOVHJH
can you record said noise?

what happens when you plug said guitar into a different amp?


I can attempt to record this noise tomorrow.
I don't have any other amps to test it out on, so I can't say if the noise is from the guitar or amp.

I can try a different guitar tomorrow though, so I can see if it's guitar or amp.

Also, keep in mind that this is a high gain amp, so I know that I'll get some hiss from the gain. but its the buzz I'm concerned with

Last edited by XxJUSTJACKxX : 10-04-2012 at 12:19 AM.
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Old 10-04-2012, 12:20 AM   #13
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what about your buddies bass amp or an amp at a store?
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Old 10-04-2012, 12:29 AM   #14
XxJUSTJACKxX
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Originally Posted by 311ZOSOVHJH
what about your buddies bass amp or an amp at a store?


I can always try it, but I'm 45 minutes away from my nearest music store, and my friends live in a different town (10-15 minutes away) so I'm not always having a chance to do that.
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Old 10-04-2012, 12:55 AM   #15
R45VT
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Originally Posted by XxJUSTJACKxX
I can attempt to record this noise tomorrow.
I don't have any other amps to test it out on, so I can't say if the noise is from the guitar or amp.

I can try a different guitar tomorrow though, so I can see if it's guitar or amp.

Also, keep in mind that this is a high gain amp, so I know that I'll get some hiss from the gain. but its the buzz I'm concerned with



Uh? You said hiss up until now. Hiss or buzz?

Really I would try the ISP up front, last item plugged into the amp. You would be amazed at what it can do.
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Old 10-04-2012, 12:58 AM   #16
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Originally Posted by R45VT
Uh? You said hiss up until now. Hiss or buzz?

Really I would try the ISP up front, last item plugged into the amp. You would be amazed at what it can do.


I'll try it, and change out cable too as a safe guard
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Old 10-09-2012, 06:29 AM   #17
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Quote:
Originally Posted by R45VT
Did you try it out front?

You typically run in the effects loop to kill noise from pedals in the loop.

Try guitar>ISP>amp.


Agreed, I tried my Boss noise gate in the fx loop of my Krank Rev Std and it didn't have the same effect as when I used it after my guitar.
There was still some "hiss" when in the fx loop but nothing when before the amp.
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Old 10-09-2012, 06:50 PM   #18
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Agreed, I tried my Boss noise gate in the fx loop of my Krank Rev Std and it didn't have the same effect as when I used it after my guitar.
There was still some "hiss" when in the fx loop but nothing when before the amp.


I figured out the issue and got everything running correctly
Once I got the Decimator in the fx loop properly it ended up boosting the volume (good or bad I'm not to worried) So now, no noise at all

Thanks for all the help!
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Old 10-09-2012, 08:51 PM   #19
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I know the problem has been solved, but are you using the stock Sovtek preamp tubes? I used to have those in my Krank Reb Jr pro and it gave me hissing in the gain channel, which went away when I dropped JJs into V2 and V3.
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Old 10-10-2012, 05:57 AM   #20
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Originally Posted by XxJUSTJACKxX
I figured out the issue and got everything running correctly
Once I got the Decimator in the fx loop properly it ended up boosting the volume (good or bad I'm not to worried) So now, no noise at all

Thanks for all the help!


Nice, out of interest what setting do you have the fx loop knob set at?
I usually have mine on full even if I have no pedals in there as it gives you a slight gain boost according to the manual.
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