What's Under My Jtv-59 Bridge?

[oehman]

Playing my JTV-59 unplugged tonight and I am getting a little buzzing back by the bridge.

Mostly when I play an open D or A string.

So I took a look to see what might be loose. Looks like there is a loose wire or something under the bridge.

Is this what it should look like?

Guess I'll have to take it to a set up shop to track the buzzing down.

 

[clay-man]

Those are just the wires for the piezo. They are supposed to be a bit loose. It's fine. Do not mess with them or you might damage the connection between the piezo and the PCB that the piezos go to.

[edstar1960]

Yep they are the standard wires and my JTV59 looks like that.

 

Interestingly enough, my JTV59 has a resonance issue when I play a D or an A note.  Particularly, if I play the A at the 7th fret of the D string (4th string).  It's really bad if I am using an acoustic model and playing through a PA speaker, hitting that note produces an enormous amount of harmonic resonance, the open D is bad too.  Things just start to ring.  It is impossible for me to control and obviously produces all sorts of strange artifacts if I am in an alternate tuning as well.  I wonder if it is the bridge design that is causing the problem - maybe that one lump of metal just happens to resonate at that frequency.  It's very frustrating, and I have not found a solution to it yet - other than not playing those notes!     

[oehman]

I've got an issue with some low end resonance too.

Seems like it is coming from the open A string. It's not always there, so I think it may be related to the JTV model and the HD500. I've had to use some high pass filter and use an EQ on my mixer to drop 125Hz a bit to tame it.

Most annoying when I strum a D chord and the open A string ring vibrate a little.

[edstar1960]

I've got an issue with some low end resonance too.

Seems like it is coming from the open A string. It's not always there, so I think it may be related to the JTV model and the HD500. I've had to use some high pass filter and use an EQ on my mixer to drop 125Hz a bit to tame it.

Most annoying when I strum a D chord and the open A string ring vibrate a little.

 

Yep - my open A rings as well.  So EQ at 125Hz - thanks for the pointer - I will try that out to see if it tames the resonance issues.

[oehman]

Getting a little off topic here, but

 

I found a solution to the A string resonating and the E and A having too much low end.

 

The problem is related to the Bassman model in my HD500.

I use that model about 3/4 of the time direct to PA. But always found that resonating frequency made things too bassy. Especially barre chords and chords with an open A.

 

Using POD edit program, click on AMP, CABINET PARAMETERS. The default for LOW CUT is 20Hz. I dialed it up to 170 Hz and that overbearing bass frequency is much better.

HTH

[Charlie_Watt]

The 20 Hz low cut must be for playing a bass guitar.  Way too low for a standard guitar.

[edstar1960]

Getting a little off topic here, but

I found a solution to the A string resonating and the E and A having too much low end.

The problem is related to the Bassman model in my HD500.

I use that model about 3/4 of the time direct to PA. But always found that resonating frequency made things too bassy. Especially barre chords and chords with an open A.

Using POD edit program, click on AMP, CABINET PARAMETERS. The default for LOW CUT is 20Hz. I dialed it up to 170 Hz and that overbearing bass frequency is much better.

HTH

Thanks for the extra info.

 

I have previously done some google research on frequencies and found this info:

 

Typical guitar speaker frequencies are 80hz to 5000hz

Guitar strings in standard tuning range from low E at 82hz to 24th fret on high E at 1319hz

 

Assuming this is correct, 170hz is close to the 2nd fretted note on the D or 4th string, which is the first E octave in standard tuning.

So you are probably cutting out too much of the natural guitar bottom end. I would think it's better to go to about 70hz on low cut, certainly no higher than 80hz which should match typical guitar speaker response.

 

Hope that helps.

[oehman]

But the low cut is a cabinet parameter. So I don't think it's cutting all frequencies under 170 like an EQ or high pass filter. And I only had to adjust my presets that use a Bassman. The JTM-45 and Park 75 sound fine with the low cut 20 Hz.

But I'll try rolling it back to 80-100 on the Bassman and see how much the droning bass frequency creeps back in.

Thanks

[katiekerry]

I had some issues with string buzzing on the bridge I remedied it by putting a strip of black electrical tape in the string slot.  I haven't had issues since good luck though..

[edstar1960]

But the low cut is a cabinet parameter. So I don't think it's cutting all frequencies under 170 like an EQ or high pass filter. And I only had to adjust my presets that use a Bassman. The JTM-45 and Park 75 sound fine with the low cut 20 Hz.

But I'll try rolling it back to 80-100 on the Bassman and see how much the droning bass frequency creeps back in.

Thanks

 

Yes it's a cab parameter and it affects the frequency response of the modelled cab.  So if a typical guitar speaker low end is 80hz, and a standard tuned guitar low end is 82hz, you only want to cut frequencies below that level.

I would think that setting it at 170hz is rolling off anything below that which is the low octave on a standard tuned guitar.   Unless the LOW CUT DEP cab parameter does something completely different, but my understanding was it does behave like an EQ high pass filter for the simulated speaker response.

[oehman]

I'm still getting a decent amount of low end with the Low Cut setting at 170 Hz.

I searched the manual to get a better idea of how the LOW CUT setting in CAB PARAMETERS works.

 

The only mention in the advanced guide is:

Knob 2 -Applies low frequency attenuation - helpful to tighten up the low end of

your tone.

 

It's not really clear whether it cuts all frequencies below that setting or how many db the cut applies or the frequency width.

[edstar1960]

 

I'm still getting a decent amount of low end with the Low Cut setting at 170 Hz.

I searched the manual to get a better idea of how the LOW CUT setting in CAB PARAMETERS works.

 

The only mention in the advanced guide is:

Knob 2 -Applies low frequency attenuation - helpful to tighten up the low end of

your tone.

 

It's not really clear whether it cuts all frequencies below that setting or how many db the cut applies or the frequency width.

 

 

Thanks for the clarification.  The Line 6 description is pretty vague.

At the end of the day, it's what you hear with your ears as the end product of your patch - so whatever parameters and values work for you.   Logically it doesn't make any sense but if the end sound is good and achieves the results you want then all is good!   Just another example of how we must experiment with everything and not just take things at face value with the HD.

[Bhitely]

80Hz is the typical frequency I cut my guitars at, 120Hz if clean.  I'll also cut anything about 5K Hz, because most guitar speakers don't go higher than that.  Makes it more "realistic".