Super Tube Ts-9 Pro. Problems with the IC

[Yoshi]

Hello, I was trying to CLON the Super Tube. Is based in a TS-9 with a mid focus knob. But when I obtain the protoboard, the pedal had a lot of clipping and to much saturation.

At the end I realice that the IC (the first one) was the problem, but I don´t know how to reduce the noise or the power.

In the image is the schematic of the pedal that I tried to clon.
Pleaseee!!! help me... I don´t know what to do!! is a beutiful pedal but the brutal saturation dont help the sound. All the best

[GibsonGM]

Hi Yoshi,  If the first IC - the input buffer - is distorting or changing the signal in a bad way, that is not normal.

Can you post the IC voltages please?

[antonis]

Pleaseee!!! help me... I don´t know what to do!!

Make R14 470k - 510k, C10 470nF (optionally), move to C10 left leg and get rid of the rest of input buffer..
(or use the amp for Q2 replacement..)

[Yoshi]

Hello, thank you very much for answering. I change the proteus file and the simulation works.. but, can I send you the diagram and thell me if is ok? It would we an honor.



All the best.

[antonis]

Delete R2 & C9 also..

P.S.
There is no reason for C1 & C2 of different values as long as their respective HPF resistors (R14 & R5) are of the same value..,
An established practice is to "tighten" the various filters going from IN to OUT so you might need (optionally) to make C2 smaller than C1..

[Yoshi]

ok!!! Done!!! what about now? I hope is ok

[antonis]

 

Plz read my P.S. also..

[Yoshi]

For sure!!! but Im new in the forum, what is a P.S? sorry if the question is a little dum

[antonis]

You're in a hurry and make me nervous..

Make R15 100k or delete it..

P.S. is a post-script which is most often a sentence or paragraph added after the signature of a letter.

[Yoshi]

ooohh!!!! you are rigth I´m over excited because the pedal can work well, sorry about that.

I made the change´s , and I didn´t know about the C1 and C2 situation, so, If C2 is larger than C1 the sound is less controlled?

[antonis]

If C2 is larger than C1 the sound is less controlled?

Quite right..
(in the mean of the frequency margin difference is practically useless 'cause a part of what is potentially controllable by C2 is already cut by C1)


Both C1/R14 and C2/R5 are 1st order High Pass filters (6db/octave slope)..
As they are cascaded, they result into 2nd order HPF (12db/octave) for frequencies covered by both of them ..
(you may need to search about filter orders and poles..)

Suppose C1/R14 cut-off frequency is lower than C2/R5 one (C1 > C2)..
We have 6 db/octave slope till signal meets C2/R5 configuration -  it then continues with a slope of 12db/octave for frequencies equal to or higher than C2/R5 one, cause C1/R14 filter overlaps C2/R5 cut-off frequency..

[Yoshi]

Wuooo!!!! that´s brutal bro!!! thanks!!!!!

By the way, There is a formula or a way to increase the output (only the volumen) of this pedal?, This question came when I was using a litle amplifier

[GibsonGM]

You'd need to learn a bit about operational amplifiers, Yoshi...this is a start!  Your 'gain parts' here are primarily non-inverting gain stages that CAN be adjusted.  There are many tutorials everywhere online, including videos on Youtube!

https://www.electronics-tutorials.ws/opamp/opamp_3.html

[antonis]

What Sir Mike said..

Just to make a brute discrimination between Gain and Volume, which might seem identical till signal amplitude hits power supply rails..

[Chugs]

Remove R3. Pin 4 of U2B should connect directly to ground.

[Yoshi]

Hey!! thank you very much!! I will work harder to know all of this!!! the information that all provided  is so valuable!! Im greatfulll

All the best