Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

Simple Circlotron with Lateral MOSFETs
Simple Circlotron with Lateral MOSFETs
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th May 2011, 12:53 PM   #21
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
You can't expect a single, 200mW JFET to drive couple of Volts into 390R load...

If you want to use buffer and SE2BAL convertor from post #1 just change R19 and R21 to 3k3
  Reply With Quote
Old 18th May 2011, 01:01 PM   #22
GuidoR is offline GuidoR  Italy
diyAudio Member
 
GuidoR's Avatar
 
Join Date: Jun 2006
Location: Bergamo
Quote:
Originally Posted by juma View Post
You can't expect a single, 200mW JFET to drive couple of Volts into 390R load...

If you want to use buffer and SE2BAL convertor from post #1 just change R19 and R21 to 3k3
There's no free ticket...

many thanks


Guido
  Reply With Quote
Old 17th May 2014, 05:12 PM   #23
vilfort is offline vilfort  United States
diyAudio Member
 
Join Date: Feb 2010
Default Turning this into a hybrid

A differential amp/driver stage can easily be built using 3 triodes like say 6sn7. Keep the output stage with the SK135 source followers. Then add a Mullard-like front end albeit with 3 triodes. Grounded cathode first. Then directly coupled into a long tailed pair. Each of the plates connected to the signal caps on the MOSEFET gates. Simple and sounds great. True midrange magic. No feedback.

D.
  Reply With Quote
Old 26th June 2014, 09:12 PM   #24
marktmeyer is offline marktmeyer  United States
diyAudio Member
 
Join Date: Apr 2005
Location: Howell, MI USA
Vilfort, I have read as much as possible of your work, and was wondering what your present take is on the Hybrid Hafler mods. I am interested in doing a tube front end to either my DH500 or one of my DH200s. Have you ever done a pc board for the tube portion?
  Reply With Quote
Old 6th March 2015, 08:15 PM   #25
drazen is offline drazen  Croatia
diyAudio Member
 
Join Date: Nov 2009
Hello everyone,
Finally I decided to make this Juma circlotron and I can say that this sounds really great. At first it was a little problem with the layout of the wiring and unstable DC offset and the current through the output MOSFET. Now everything is stable and is a great pleasure to hear the presentation of the sound of this amplifier.
I am very pleased and grateful to the constructor on the project.
PS. Cubie will wait a while to build.
Attached Images
File Type: jpg 1.jpg (472.7 KB, 549 views)
  Reply With Quote
Old 6th March 2015, 11:54 PM   #26
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
Hi Drazen,
congrats on your build, I'm glad you like it !

Talking about Cubie - I got a new circuit simmering, it'll be ready in a month or three...
  Reply With Quote
Old 7th March 2015, 06:29 AM   #27
drazen is offline drazen  Croatia
diyAudio Member
 
Join Date: Nov 2009
Thank juma,

cirklotron after the trial period need housing, front, rear and top plate, which are now under construction.
Following the theme Cubie
  Reply With Quote
Old 25th May 2015, 05:53 AM   #28
stein2 is offline stein2  Serbia
diyAudio Member
 
stein2's Avatar
 
Join Date: Feb 2007
Location: Subotica
I'd like to add a small contribution here. Built one of these but as a completely different beast with E88CC in gain stage instead (with a lot of help from Juma and Zen, to be noted) and later needed to figure out is there any difference in sound between the original and the hybrid version, so, built one more, this one, but as I didn't want SE on input, tried a bit different approach. It works fine (huge understatement) but I usually say "fine" when I can't find anything that would bother me. On the attached images the fulldiff sch. of the gain stage, one messy image of the amp and where it's used. This amp is the black one at bottom with the big VU meters...
Attached Images
File Type: gif cirklotron_balanced_in_OPA1632.gif (12.6 KB, 395 views)
File Type: jpg cirklotron_opa1632.2SK1058.jpg (138.3 KB, 392 views)
File Type: jpg systemjan2015_09.JPG (139.7 KB, 379 views)
__________________
"Calculations? We don't need no stinkin calculations! We just make them really big!" - Papa
  Reply With Quote
Old 21st February 2018, 08:55 AM   #29
coolnose is offline coolnose  Europe
diyAudio Member
 
coolnose's Avatar
 
Join Date: Sep 2009
Quote:
Originally Posted by juma View Post
You can't expect a single, 200mW JFET to drive couple of Volts into 390R load...

If you want to use buffer and SE2BAL convertor from post #1 just change R19 and R21 to 3k3
Juma,

could I use your SE2BAL from the schematic using J271 (maybe in //) by "just" inverting the supply voltages ?

Thanks in advance for your comment.

Regards,

Max
  Reply With Quote
Old 21st February 2018, 09:15 AM   #30
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
It should work with P-channel JFET (J271 with inverted polarity for buffer cell) but I'm not sure if it's worth the effort - lower gm, wildly varying Idss, different transfer curve....
You'll have to test and experiment a bit...
__________________
Please don't use private messages for question related to audio projects. It defeats the purpose of the forum.
  Reply With Quote

Reply


Simple Circlotron with Lateral MOSFETsHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lateral Mosfets for sale Fanuc Swap Meet 20 28th March 2009 10:17 AM
Substitute Lateral Mosfets joensd Parts 33 21st December 2008 01:57 PM
Lateral mosfets - why ? Stormo Solid State 5 2nd July 2003 07:14 AM
Lateral Type Mosfets Diogo Solid State 4 30th September 2002 08:11 AM


New To Site? Need Help?

All times are GMT. The time now is 06:40 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki