Buffer with opamp 2134

[sopapo]

Hello I am new in this great board I hope to learn and share many things with you....
first, excuse me for my english....

I tried a simple buffer with opamps (OPA 2134 or 4558 or TL072), a basic thing,the typical topology of a circuit only with a biased point of two resistor of 2 M in the + input and the raw feedback loop and 0,1 uF poli cap in the input and a 10 uF cap in the output...... and it doesn´t do the thing for me.....it colour the signal more than desirable...especially in the realm of dinamics.....it dampen the dinamic of the guitar....... and tonewise it turn alittle more artificial (its very little)

I know that a little change ibn the sound there will be but in my tryings there are more than this.....

it for this that I am triyng something more to achieve the most transparent sound posible

I wonder if somethiingthis topology will make an improvement(with the appropiate changes for a guitar signal)

http://www.pha.inecnet.cz/macura/index_en.html

on the left click audio page and then, in "Proyects" click "Audio buffer"

I wonder if I could apply this topology of using and 627 (or 2134) wirh a buf634 in the feedback loop  to electric guitar signals

There a few changes that I imagine that its basic to do

first of all the input impedance has to be around 1M or so because the impedance of the e guitar is around 9,5 -11k and they would like to see the impedance of a input of guitar amp (around 1M too)

another thing is that it could be powered by 4,5 V since it must be powered by battery or 9 volts the question is (this op work well withis tension?) in the pdf os 627 it says that the minimum tension supply is 4,5....

do you think that there will be an improvement with this over the raw opamp and two resistors?

Its the opamp working in class A the thing to do for this case? (or the discrete in class A)

do you think that I would go discrete? do you know other designs for this?

I would like your opinions

Thanks for all

[sopapo]

Anyone has trying this chip or similar to do a buffer?

I 'd try discrete I think.....