Another cool article on tube simulation by Viktor Kempf

[markusw]

http://www.sugardas.lt/~igoramps/article68/article.htm

There is also an impressive sound sample...

Direct link to google translation doesn't work 

[aron]

WOW, I need to try this!

[gez]

Direct link to google translation doesn't work 

Shame, I'd love to know what it says. 

[Jason Stout]

Try Babelfish for translation. It Seems to work ok.

[gez]

Try Babelfish for translation. It Seems to work ok.

Cheers, I'll take a look tomorrow (late here).

[jaytee]

Looks interesting that. It looks similar to the Peavey transtube idea. The diode simulating the grid being driven positive.

[jrc4558]

I'm leaving for a week. once back (after 11th), I can translate the whole thing for you guys.
For very rough translation you can use the http://www.online-translator.com/text.asp?lang=en

Good luck!

[brett]

Hi
to me, it looks like the diode clippers on the input to the FET are used in a way that makes clipping non-linear and asymetric. Consider the first one. For the signal to be clipped by the diode ("make it" to the AC connection to ground at the + end of the capacitor), the diode needs to be forward biased. Of course, as usual it will forward conduct at about 0.7 V (for a typical Si diode). But the signal also appears (unamplified) at the source.  Let me assume that the voltage dividing resistors on the source are equal. The voltage on the source end of the diode would then be half the signal going in.  For positive signals, that will reduce conduction compared with a diode-to-ground type.  For negative signals, that would boost conduction, if not for the fact that the signal voltage here is only half of what's on the other end (and which is therefore reducing conduction by even more).

Looks really clever to me, though I suspect that the biasing will need to be "just right" to get the desired effects. ie the cathode (-) of the diode will need to be at just the right voltage.
cheers

[markusw]

I'm leaving for a week. once back (after 11th), I can translate the whole thing for you guys.
For very rough translation you can use the http://www.online-translator.com/text.asp?lang=en

Good luck!

That would be great!!  Thanks a lot in advance!

Although the online translations are OK to get an idea they are a tough read 

[raulgrell]

This is a brilliant article that cannot be left to waste! It wasn't even on the front page!
I don't know about most of you out there, but this is by far the best tube simulation circuit I've seen in my life...

[soulsonic]

There's so much good stuff on Igor's page!!!!
I've been studying the whole site for over a week now, and it's full of great ideas and projects.

[Darkness, Darkness]

it looks interesting. Has anyone try these ideas ?  If so, how much different does it sound from the ROG Fetzer valve ?
(By the way, has anyone a better translation than online tools ?)

[Ben N]

Babelfish is not bad. Interestingly, it mangles device designators, so 12AX7 comes out "YАKH".

YАKH?

[Darkness, Darkness]

Yeah  Not too bad indeed !

(but there must be a size limitation with babelfish It looks like the end of the article is lost. Anyway just translate manually the missing part of the text in babelfish)

Have you try this design ?

[spud]

Hey, what happened to this thread?  Any more info.  I couldn't get a real clean translation no matter what I did.  Always had some parts of it getting messed up. 

Well, thought I'd bump it and see if anyone had a good translation of it.

Jim

[mac]

Nice! Good project for this month FX-X.

mac

pd: doh! my 3 fet stages design has the diodes at the source! 

[Steben]

Is this to be combined with second generation fetzers?
looks to be in the simple solution range...

[Cliff Schecht]

I've got a great PDF file on how to make an all tube theremin, unfortunately it's in Italian and I haven't been able to fully translate it - even with professional translating software. If anyone is interested shoot me a PM and I can forward the file, it's still an interesting read if you can figure out some Italian.

[slideman82]

To Marcelo Tripodi:

I wanted to ask you why you put those diodes instead of source resistors? Interesting...

Should we talk between us in Spanish?

[slideman82]

Mmmm 4 stages... could this make some oscilation?