JC Maillet FET triode emulator

Stompboxes circuits published in magazines, books or on DIY electronics websites.
Post Reply
User avatar
RnFR
Old Solderhand
Information
Posts: 4881
Joined: 09 Jan 2008, 06:02
my favorite amplifier: Traynor YBA-III, Fender Super Six
Completed builds: custom fuzz.
Location: Inner Earth
Has thanked: 139 times
Been thanked: 130 times
Contact:

Post by RnFR »

a new article by JC. haven't had a chance to go over it all, but it looks interesting!

http://www.lynx.net/~jc/transferCurvatu ... ation.html
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic

Blog-APOCALYPSE AUDIO

User avatar
bajaman
Old Solderhand
Information
Posts: 4429
Joined: 26 Jun 2007, 21:18
Location: New Brighton, Christchurch, NZ
Has thanked: 509 times
Been thanked: 1834 times

Post by bajaman »

thanks for that - JC is always interesting and he KNOWS his stuff :wink:
bajaman
be kind to all animals - especially human beings

User avatar
gena_p1
Breadboard Brother
Information
Posts: 82
Joined: 25 Apr 2009, 21:47
Location: Russia
Has thanked: 23 times
Been thanked: 11 times

Post by gena_p1 »

Some related stuff (in russian, but with links to projects and demos (compared to original vacuum devices)) about vacuum triode emulation with high voltage (180-200V) FETs:

http://forum.gtlab.net/cgi-bin/yabb2/Ya ... 201423/900

fet jcm800 inside: Image

example project is on this page: http://forum.gtlab.net/cgi-bin/yabb2/Ya ... 201423/840

User avatar
teemuk
Breadboard Brother
Information
Posts: 147
Joined: 17 Aug 2009, 19:54
Has thanked: 3 times
Been thanked: 55 times

Post by teemuk »

gena_p1 wrote:Some related stuff...
OT: Browse the directory the image is located in (http://milas.spb.ru/~kmg/files/) to find schematics of e.g. Bogner Ecstacy, Mesa Boogie Mark V and Mesa Boogie Road King II. :secret:

User avatar
KMG
Solder Soldier
Information
Posts: 209
Joined: 02 Feb 2010, 20:26
Location: Russia
Has thanked: 5 times
Been thanked: 79 times
Contact:

Post by KMG »

Most of pages on my website http://milas.spb.ru/~kmg/ translated on English, I apologize myself if the quality of translation is poor
Image

User avatar
KMG
Solder Soldier
Information
Posts: 209
Joined: 02 Feb 2010, 20:26
Location: Russia
Has thanked: 5 times
Been thanked: 79 times
Contact:

Post by KMG »

I offer the article about using mosfets in gitar amps
http://milas.spb.ru/~kmg/irf_en.html
This is an opinion of one DIY`er and musician:
KMG and OldMike, I hasten to share impressions and at the same time express respect for useful improvements to the CF using mosfet.
Today I tested latest version of the schematics (where the two diodes in the "cathode"), the result is just great!
The prototype had an opportunity to compare the three options: CF on the tube, an ordinary follower on the mosfet and subject.
Now I tell terrible thing ... Subject sounds better than the other two variants! Yes, yes, you heard right, variants KMG and OldMike on mosfet sounds better than "native" CF on the tube!
Resistor at the source for my IRF740A was 960 ohms (1K set), the drop of UA in the absence of the previous stage was 45V. As the diodes used a series of the FR107 and UF4004.
The sound is very musical. Miracles.
Image

User avatar
bajaman
Old Solderhand
Information
Posts: 4429
Joined: 26 Jun 2007, 21:18
Location: New Brighton, Christchurch, NZ
Has thanked: 509 times
Been thanked: 1834 times

Post by bajaman »

Hey welcome KMG :D
and thanks for sharing this information with us here.
I have already visited your site - you Russian guys are doing some very interesting research with jfets too :wink:
I have visited GT Lab - some very interesting designs from Anton and Old Mike and you. Xbananov's work is very good too :wink: Amazing how a diode in the right place and a Jfet can emulate the triode's control grid characteristics - they work much better at 30v instead of 9v :)
Welcome to freestompboxes - it is fantastic to have you on board :thumbsup
Kindest regards
bajaman
be kind to all animals - especially human beings

User avatar
RnFR
Old Solderhand
Information
Posts: 4881
Joined: 09 Jan 2008, 06:02
my favorite amplifier: Traynor YBA-III, Fender Super Six
Completed builds: custom fuzz.
Location: Inner Earth
Has thanked: 139 times
Been thanked: 130 times
Contact:

Post by RnFR »

yes, welcome, and thanks for the info! it's definitely very cool stuff you guys are doing, and i'm sure many would love to hear more about it in the future. :D
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic

Blog-APOCALYPSE AUDIO

User avatar
KMG
Solder Soldier
Information
Posts: 209
Joined: 02 Feb 2010, 20:26
Location: Russia
Has thanked: 5 times
Been thanked: 79 times
Contact:

Post by KMG »

And at 200V circuit work much better than at 30V.
All guys who plays on my designs notice wide dynamic range allowing to get sounds from clean trough crunch into deep distortion using only volume control on guitar.
Image

User avatar
KMG
Solder Soldier
Information
Posts: 209
Joined: 02 Feb 2010, 20:26
Location: Russia
Has thanked: 5 times
Been thanked: 79 times
Contact:

Post by KMG »

Added article about my way to emulate vacuum triode by mosfet (collectiom of my information on GTLab)
http://milas.spb.ru/~kmg/tubeemulation_en.html
Image

Post Reply