PhAbb SS AmpDemo

[rodriki1]

as i said to you i found this thing very interesting.
It sounds very ingenuous but if we take attention to this article:

http://www.digitalprosound.com/2002/03_mar/tutorials/mixing_excerpt1.htm

4KHz is the edge zone...
just where i found that marshall would be... very
helpfull article.

if you play this thing with earphone you will be surprised...

I am very convinced that equalization is the most important matter about
music now... i have kept my self long time very much worried (concentrated) about
harmonic distortion (even odd harmonics etc) and compression, soft clipping etc.
this thing is not so much the secret..

WHY SANSAMP IS SO MUCH FAMOUS??
Almost the entire circuit is dedicated to equalization!!!!!!!

i found it very good that you have energy and interest to get some time of experimentation with the idea.

As i said before using a software that gives you the chance to use equalization,
will give  a very large idea of how important equalization is....

i will find some time to make experiences here too..

We are used to see thowsands of circuits around the web... but some of then have a special potencial not very much considered..

One of them is the "super tube" of ibanez that uses this aproach to get
mid range equalization (changing  edge etc) and some tube simulation from
PEAVEY (patented). The last has some kind of PRESENCE  control as you mentioned...

But as i said there is not much TALKING about this thing... very rarely
some body comes to really compare something to tubes...
For me there is not this thing anymore.. something like tube sound..
What exists is TUBE AMP SOUND.
And the most important feature of a tube amp is the low damping output...
the equalization curve caused by higher output impedance interacting wih the speaker and the type of speaker usually used.

As said before the aproach used in tube screamer for distortion
sounds horrible when you want simulation of tube amp (power amp section)...
usually we have non inverting op amp in conjunction with diodes to give distortion.
I recommend the INVERTING APROACH like JD-10 from morley or stephan moeller ideas...

Transistor amp usually are made for general purpose (with high damping)...
But we like the effect caused by low damping, wich is A PEAK IN 100HZ and after
a raising gain until it fall down into 4khz, just like the treble booster...
The low damping and the box with the speaker does that...

I can clearly hear the sound the 4x12 box today...
As if the guitar sound is inside a wood box...

sorry by my simple english... have to improve my skill with the language...
hope some have benefits  with this things...

Much of what i said may sound silly but give yourself a time to give a better
look of what we say here and find you own conclusions... maybe could be fun...
thanks!!!!

[phatt]

Damping comes into it I'm sure but keep in mind that you can build tube amps that go down way past 100hZ (with damping) and a guitar through such a circuit will likely sound horrible.

If you simulate a (Classic guitar type) tube power section note the best sounding tube amps for guitar have a big steep roll off below 100hZ. So in my limited understanding low freq limiting may have more to do with the final result.

The *super TS10* does use a vaugely similar circuit but here again the mistake is made by trying to do everything around 1 little opamp. (I had a TS10, it was way to peaky)

My concern for the *Presence circuit* is *Peaking*. On it's own it may sound good but adding a lot of gain in other circuits (before or after) may lead to oscilations.

With my setup this is working ok but does introduce a fair bit of noise which is why I say,, don't get to keen on uping the boost/gain and it will likely be a good idea.
Have fun, Phil.

[stm]

It's a pity that files attached to this thread are no longer available (getting a 404 error).  I wanted to listen to the clips.

[joecool85]

Hopefully Phil can post it again, it must have been lost during our forum issues we had at the beginning of last year  :grr

[sjturbo]

For some reason I am unable to open the audio files for the amp demo  :grr. Is there some program I don't have?

[phatt]

OK, ok  I forgot about this one.
Cross my fingers and hope It works for you now. :tu:
Tested them and they unzip ok for me.