New FET distortion schematic...sensation?

[stm]

Medved, PM sent.

[Medved]

stm, i've sent an e-mail, but there is no answer.
http://webdrive.reborn.ru/egorov/Bogner/comp.rar
(272kb)
One sample is tube BognerTG Sharp channel, another- FET preamp.
Any assumptions?

[stm]

Medved, I'm afraid I didn't get your message.  Most likely the spam filter took it away.

I developed a couple of equations for the simplified circuit with one Drain and one Source resistors.  I can calculate the source resistor (Rs) for a given FET (Vp, Idss) with a given supply voltage (Vcc), with a give drain resistor (Rd) and a given biasing drain voltage (Vd).  The formula is not simple, as it includes a squareroot.  This assumes the source resistor (Rs) is bypassed by a large capacitor.

I also derived a formula to predict gain in the above condition, which again is rather cumbersome.  I have them at home, so let me know if you want me to post them.

Cheers.

[torben74]

Did anyone try to build this actually?

I have access to 2n5484 2n5486, but those have quite high cutoff voltage ... 1.1- 1.3V (5484) and 3.7-4.5V (5486). Could I try with these or should I try to get access for some J20x:s.

[MR COFFEE]

Hell yeah!!!!!!!!!

Let's get this thread back on track.

STM - did you and xyeBo ever get the collaboration going?

mr coffee

[demym]

another vote for thread re-opening !!

i think it's time for a new generation of F4T :-)

[DDD]

First of all, guys, let's forget the word "xyeBo" since the word is pretty bad, OK?

[dmc777]

Agreed. Very interested in reading this.

[MetalGuy]

AFAIK the "brains" behind those russian FET distortions are currently working for AMT Electronics (also russian). As a result now you have FET pedals such as M-1, P-1, F-1, R-1 etc. which means they would be somewhat reluctant to share more than what is already available. There are also some interesting ideas about emulating  FETs with opamps but most links to schematics are dead now.

[Brymus]

Here is something similiar and Google translates it into English for me.
All of these designs are very excellent ,dead ringers to my ears, of the original amps they emulate.
http://www.guitarjfet.ru/index.php?option=com_content&task=view&id=30&Itemid=34

I would get those schematics while they are still there.
I have wanted to try some of them all year but just too busy.
I listened to the sound samples when I first found this and they all sounded excellent.

I found the above link here at DIYSB somewhere originally if IIRC.

This one too,this guy's stuff is awesome very realistic sounding FET emulations and cab sims. http://milas.spb.ru/~kmg/index_en.html

This is a similiar page with scope shots.It also translates with Google.
http://www.sugardas.lt/~igoramps/article68/article.htm

This will help with your cross referencing of part numbers. http://matthieu.benoit.free.fr/cross/russian_equiv.htm

As will this one: http://www.ok1rr.com/e107_plugins/content/content.php?content.28

Here is more related FET stuff: http://www.radiomuseum.org/forum/the_trioderizer_a_solid_state_triode.html

http://www.diystompboxes.com/smfforum/index.php?topic=70065.80

http://home3.netcarrier.com/~lxh2/

[Earthscum]

The sugardas site just explained how a circuit works that I'm making right now. Gonna go board it shortly and get it finalized and drawn up. Uses J201's.

Thanks for the links. Just motivated me!

[wormfooduk]

The top link above has a Mesa boogie sim that's not a doctor boogie may be worth boarding up although some of the transistors look like there models I haven't seen before?

[Davelectro]

Cool ideas! But these guys need to hire a translator...or we should learn russian. I can't follow all they say as i do with the fetzer valve article. 

[Pigyboy]

This is from the page Brymus posted the link to above. What are the V's with 4 pins?

[nick d]

                     Possibly dual-gate mosfets - the only thing I've seen with 4 pins in a metal case . Worth a shot.

[Brymus]

Glad I could help create interest in these FET emulations.
Hopefully some will be verified and layouts drawn up for the forum at some point.

[caspercody]

I did accouple Eagle layouts of some of these schematics. I never made any, I was just tyring to learn how to use Eagle. If anyone wants them let me know. I can not say they are the best designs.

[Pigyboy]

I did accouple Eagle layouts of some of these schematics. I never made any, I was just tyring to learn how to use Eagle. If anyone wants them let me know. I can not say they are the best designs.

Put them up please. It is another place to start. Can you post the eagle files too so we can use what you have already done?
Thanks
Chris

[torben74]

Nice to hear there is people who like this article too. I've been reading these victor kempf /xbananov articles for few weeks now. I have become an big fan of his works.

Specially i am amazed of this 4fet high-gain cascode thingy. I just havent found an sound sample if this four fet cascode thing, which would be nic :icon_biggrin:e to heart. Getting those even harmonics with solidstate, ü

For me google chrome does the job for translating from rus-eng . Its not perfect, but readable...

I hope to get some lab.time soon to start with protos.

VICTORTION is my idea if a petname 

[caspercody]

I have nver figured out how to attach files on this forum. If you send me a PM with your email address, I can send them to you.