Mesa JP-2C 'Shred' and Squeal

[journeyman73]

I posted this one another forum but thought i would try here too...I know the JP-2C manual suggests that using shred mode at higher gain levels and/or with prsence/treble dialed higher can lead to the amp squealing.

I am having this happen on a new jp-2c and am a little surprised how quickly it starts to squeal (i had thought the warning was more intended to tell you not to dime those knobs).

Im curious for those that use Shred, where are your gain (pushed/pulled), presence and treble set when this starts to happen on your amp? What about the volume knob?

Thanks!

 

[splawner]

g These are my setting and I use the shred on both channels... I do not get any squeal at all...I can't imagine running my presence and treble up any more than they are...

 

[spanny]

I don't have that problem either. I run my gain at 11:00 and my presence at noon.

 

[journeyman73]

g These are my setting and I use the shred on both channels... I do not get any squeal at all...I can't imagine running my presence and treble up any more than they are...

Thanks - are your presence knobs pushed in for those settings?

 

[K-Roll]

could be that your bridge pickup is slightly higher than other people's? I noticed that sometimes raising the pickup by 1mm yields quite some different results and of course the squeal is more prominent and easier to be picked up on certain amps compared to others. try working with your guitar and don't forget to rule out any cable related issues first.

Btw it could also be a microphonic preamp tube, as good as mesa are in QCing their supplies, it will happen eventually and you may simply be the guy who got a faulty one.

 

[splawner]

g These are my setting and I use the shred on both channels... I do not get any squeal at all...I can't imagine running my presence and treble up any more than they are...

Thanks - are your presence knobs pushed in for those settings?

Only on channel 3 it's pulled along with the gain knob...

 

[journeyman73]

g These are my setting and I use the shred on both channels... I do not get any squeal at all...I can't imagine running my presence and treble up any more than they are...

Thanks - are your presence knobs pushed in for those settings?

Only on channel 3 it's pulled along with the gain knob...

Yeah, if i ran those settings on ch 3 with presence pulled (let alone gain pulled) it would definitely squeal - do you run with your ch3 volume up a decent amount?

Dont know if i should start playing with tubes or which ones to start with....its cramped back there...i guess downside to compact head...maybe i should just return it...i dont like having to worry about knob settings, even when not in extreme ranges, causing ridiculous feedback levels

 

[splawner]

g These are my setting and I use the shred on both channels... I do not get any squeal at all...I can't imagine running my presence and treble up any more than they are...

Thanks - are your presence knobs pushed in for those settings?

Only on channel 3 it's pulled along with the gain knob...

Yeah, if i ran those settings on ch 3 with presence pulled (let alone gain pulled) it would definitely squeal - do you run with your ch3 volume up a decent amount?

Dont know if i should start playing with tubes or which ones to start with....its cramped back there...i guess downside to compact head...maybe i should just return it...i dont like having to worry about knob settings, even when not in extreme ranges, causing ridiculous feedback levels

Hmmm ya i can turn mine up with no squeal at all...Not sure what's wrong with your amp...

 

[journeyman73]

g These are my setting and I use the shred on both channels... I do not get any squeal at all...I can't imagine running my presence and treble up any more than they are...

Thanks - are your presence knobs pushed in for those settings?

Only on channel 3 it's pulled along with the gain knob...

Yeah, if i ran those settings on ch 3 with presence pulled (let alone gain pulled) it would definitely squeal - do you run with your ch3 volume up a decent amount?

Dont know if i should start playing with tubes or which ones to start with....its cramped back there...i guess downside to compact head...maybe i should just return it...i dont like having to worry about knob settings, even when not in extreme ranges, causing ridiculous feedback levels

Hmmm ya i can turn mine up with no squeal at all...Not sure what's wrong with your amp...

I'm wondering - next time you get a chance, if you wouldn't mind bumping up your gain and treble knobs and see if you pretty quickly get into squeal territory? interestingly, when i try your settings (and don't get the master to high - i.e. keep it around 10-11 o'clock, no squeal) - increasing the gain, treble, and/or volume knob pretty quickly gets continuous squeal - so, id be pretty curious if yours is right on the 'edge' like mine seems to be at these settings!

thanks - I'm trying to figure out if i want to return the amp as my refund period is closing (i don't want to take a chance on thinking its just preamp tubes when its not)

 

[Candiria]

thanks - I'm trying to figure out if i want to return the amp as my refund period is closing (i don't want to take a chance on thinking its just preamp tubes when its not)

The only reason to stress about a return period is if you don't like the amp. You're covered for 5 years for everything except tubes, only 6 months for tubes. Just take it to a Mesa authorized tech and have them look at it, or email Mesa for a couple free preamp tubes and check that yourself first.

 

[journeyman73]

thanks - I'm trying to figure out if i want to return the amp as my refund period is closing (i don't want to take a chance on thinking its just preamp tubes when its not)

The only reason to stress about a return period is if you don't like the amp. You're covered for 5 years for everything except tubes, only 6 months for tubes. Just take it to a Mesa authorized tech and have them look at it, or email Mesa for a couple free preamp tubes and check that yourself first.

i get that - id still much rather avoid knowingly taking a brand new amp that immediately gets a warranty repair.

 

[Anonymous]

thanks - I'm trying to figure out if i want to return the amp as my refund period is closing (i don't want to take a chance on thinking its just preamp tubes when its not)

The only reason to stress about a return period is if you don't like the amp. You're covered for 5 years for everything except tubes, only 6 months for tubes. Just take it to a Mesa authorized tech and have them look at it, or email Mesa for a couple free preamp tubes and check that yourself first.

i get that - id still much rather avoid knowingly taking a brand new amp that immediately gets a warranty repair.

It may just be a tube though, man. Happens. I wouldn't consider that a warranty repair.

Steve

 

[journeyman73]

thanks - I'm trying to figure out if i want to return the amp as my refund period is closing (i don't want to take a chance on thinking its just preamp tubes when its not)

The only reason to stress about a return period is if you don't like the amp. You're covered for 5 years for everything except tubes, only 6 months for tubes. Just take it to a Mesa authorized tech and have them look at it, or email Mesa for a couple free preamp tubes and check that yourself first.

i get that - id still much rather avoid knowingly taking a brand new amp that immediately gets a warranty repair.

It may just be a tube though, man. Happens. I wouldn't consider that a warranty repair.

Steve

yeah, i wouldn't either. that was my point

 

[Anonymous]

thanks - I'm trying to figure out if i want to return the amp as my refund period is closing (i don't want to take a chance on thinking its just preamp tubes when its not)

The only reason to stress about a return period is if you don't like the amp. You're covered for 5 years for everything except tubes, only 6 months for tubes. Just take it to a Mesa authorized tech and have them look at it, or email Mesa for a couple free preamp tubes and check that yourself first.

i get that - id still much rather avoid knowingly taking a brand new amp that immediately gets a warranty repair.

It may just be a tube though, man. Happens. I wouldn't consider that a warranty repair.

Steve

yeah, i wouldn't either. that was my point

If you can't do it yourself, why not take it to an authorized tech and ask them to just check the tubes and see if that is the problem? If the tubes are good, get the amp back and just return it at that point...

Also, sometimes warranty issues happen - a bad solder joint, crimped wire, bad component, can happen. No need to return the amp for something like that. Just get it fixed and everything is cool. I bought a brand new $130K Mercedes and it has been called back twice for warranty repairs in less than two years - it's not that unusual...

Steve

 

[journeyman73]

thanks - I'm trying to figure out if i want to return the amp as my refund period is closing (i don't want to take a chance on thinking its just preamp tubes when its not)

The only reason to stress about a return period is if you don't like the amp. You're covered for 5 years for everything except tubes, only 6 months for tubes. Just take it to a Mesa authorized tech and have them look at it, or email Mesa for a couple free preamp tubes and check that yourself first.

i get that - id still much rather avoid knowingly taking a brand new amp that immediately gets a warranty repair.

It may just be a tube though, man. Happens. I wouldn't consider that a warranty repair.

Steve

yeah, i wouldn't either. that was my point

If you can't do it yourself, why not take it to an authorized tech and ask them to just check the tubes and see if that is the problem? If the tubes are good, get the amp back and just return it at that point...

Steve

it was just a timing thing - my return period ends soon and i wasn't sure how quickly i could look at it myself or bring it somewhere. i just didn't want to be stuck after having tried tube solutions (myself or bringing it to someone else) with an amp that needed a more fundamental repair. anyway, i don't think its the tubes

 

[Anonymous]

thanks - I'm trying to figure out if i want to return the amp as my refund period is closing (i don't want to take a chance on thinking its just preamp tubes when its not)

The only reason to stress about a return period is if you don't like the amp. You're covered for 5 years for everything except tubes, only 6 months for tubes. Just take it to a Mesa authorized tech and have them look at it, or email Mesa for a couple free preamp tubes and check that yourself first.

i get that - id still much rather avoid knowingly taking a brand new amp that immediately gets a warranty repair.

It may just be a tube though, man. Happens. I wouldn't consider that a warranty repair.

Steve

yeah, i wouldn't either. that was my point

If you can't do it yourself, why not take it to an authorized tech and ask them to just check the tubes and see if that is the problem? If the tubes are good, get the amp back and just return it at that point...

Steve

it was just a timing thing - my return period ends soon and i wasn't sure how quickly i could look at it myself or bring it somewhere. i just didn't want to be stuck after having tried tube solutions (myself or bringing it to someone else) with an amp that needed a more fundamental repair.

I get it, read my post that was edited while you were responding. I doubt this problem is anything more than what I mentioned. No need to return, just let them repair the minor issue...

Steve

 

[journeyman73]

thanks - I'm trying to figure out if i want to return the amp as my refund period is closing (i don't want to take a chance on thinking its just preamp tubes when its not)

The only reason to stress about a return period is if you don't like the amp. You're covered for 5 years for everything except tubes, only 6 months for tubes. Just take it to a Mesa authorized tech and have them look at it, or email Mesa for a couple free preamp tubes and check that yourself first.

i get that - id still much rather avoid knowingly taking a brand new amp that immediately gets a warranty repair.

It may just be a tube though, man. Happens. I wouldn't consider that a warranty repair.

Steve

yeah, i wouldn't either. that was my point

If you can't do it yourself, why not take it to an authorized tech and ask them to just check the tubes and see if that is the problem? If the tubes are good, get the amp back and just return it at that point...

Steve

it was just a timing thing - my return period ends soon and i wasn't sure how quickly i could look at it myself or bring it somewhere. i just didn't want to be stuck after having tried tube solutions (myself or bringing it to someone else) with an amp that needed a more fundamental repair.

I get it, read my post that was edited while you were responding. I doubt this problem is anything more than what I mentioned. No need to return, just let them repair the minor issue...

Steve

fair point

 

[reilly]

Similar settings on my JP2c, if you are standing right in from of the amp it is going to squeal with the shred mode (shred is noisy), I think finding the sweet spot for the treble and presence is going to be important. Also as mentioned check your pickup hight. I also use a noise gate to help tame the feedback

 

[K-Roll]

Similar settings on my JP2c, if you are standing right in from of the amp it is going to squeal with the shred mode (shred is noisy), I think finding the sweet spot for the treble and presence is going to be important. Also as mentioned check your pickup hight. I also use a noise gate to help tame the feedback

every amp will squeal if you stand right in front of it, it's physics, your pickups will pick all the noise coming from your cab and cycle back through the amp gain stages..

 

[GJgo]

With Shred I pull the treble back to around 1:30 but I don't change the gain.

Try diming the presence & pulling it back with the 6600 slider.