Jfet complimentary input stage or Jfet LTP? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 1st July 2015, 06:18 AM   #1
diyAudio Member
 
Join Date: Aug 2012
Default Jfet complimentary input stage or Jfet LTP?

which one would you prefer is it complimentary input stage or Jfet LTP.

According to cordell book he speaks that matching the n and p channel in complimentary input stage is more time consuming and also you just need to buy alot of them to match it properly or it ends up with second harmonic distortion.

where as the LTP doesnt have that problem so which one is best sonically?
  Reply With Quote
Old 1st July 2015, 07:47 AM   #2
diyAudio Member
 
Join Date: Jun 2004
Location: France
So you could ask CFA of VFA ?
  Reply With Quote
Old 1st July 2015, 08:53 AM   #3
diyAudio Member
 
Join Date: Aug 2012
any of it..
  Reply With Quote
Old 1st July 2015, 12:33 PM   #4
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi rhythmsandy,
Bob is 100% correct. These days especially, go for the standard differential pair. Trying to match complimentary pairs is extremely difficult with J-Fets, and you will never actually get a match.

Personal opinion ... J-Fet Differential pair (single) sounds the best if the rest of the design is up to it.

-Chris
__________________
"Just because you can, doesn't mean you should" © my Wife
  Reply With Quote
Old 1st July 2015, 12:46 PM   #5
diyAudio Member
 
Join Date: Dec 2005
Location: Kuala Lumpur
Finding a decent p channel jfet these days is hard
  Reply With Quote
Old 1st July 2015, 12:49 PM   #6
dadod is online now dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Quote:
Originally Posted by anatech View Post
Hi rhythmsandy,
Bob is 100% correct. These days especially, go for the standard differential pair. Trying to match complimentary pairs is extremely difficult with J-Fets, and you will never actually get a match.

Personal opinion ... J-Fet Differential pair (single) sounds the best if the rest of the design is up to it.

-Chris
Not complimentary but complementary! Completely different meaning.
  Reply With Quote
Old 1st July 2015, 01:47 PM   #7
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi dadod,
I therefore compliment you on your catch. Spell check + holiday (in Canada) + no coffee yet means my posts ought to be interesting today. I'm falling asleep here.

I have to sort that coffee situation out fast! Hurry up coffee maker!

-Chris
__________________
"Just because you can, doesn't mean you should" © my Wife
  Reply With Quote
Old 2nd July 2015, 05:54 AM   #8
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
Quote:
Originally Posted by dadod View Post
Not complimentary but complementary! Completely different meaning.
The term "complement" once would have been learned at primary/grade school. I think the subject was Geometry, where any two angles were complementary if they summed to 90°. Obviously, that isn't the only application for the term.

Nowadays, spelling gaffs go ignored among countries in which English is the lingua franca. A problem arises though, when we meet in a global forum as here, and translation software gives inappropriate or nonsense results for mis-spellings.

It's also easy to offend when you don't realize how slang or street talk expressions will translate via a Google 'bot.
__________________
Ian
  Reply With Quote
Old 3rd July 2015, 05:15 AM   #9
diyAudio Member
 
Join Date: Aug 2012
yeah Complimentary...!
  Reply With Quote
Old 3rd July 2015, 05:15 AM   #10
diyAudio Member
 
Join Date: Aug 2012
Quote:
Originally Posted by anatech View Post
Hi rhythmsandy,
Bob is 100% correct. These days especially, go for the standard differential pair. Trying to match complimentary pairs is extremely difficult with J-Fets, and you will never actually get a match.

Personal opinion ... J-Fet Differential pair (single) sounds the best if the rest of the design is up to it.

-Chris
I see alot of matched pairs available for sale.

If matched then wouldnt that be better?
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pros and cons of using JFET input stage rhythmsandy Solid State 44 27th July 2015 01:35 AM
biased jfet input stage maxpou Solid State 11 16th March 2012 01:36 PM
Complementary JFET-JFET cascode input, BJT VAS-Drivers, Lateral Output Neutrality Solid State 53 23rd October 2011 06:53 PM
FS: PreAmp with Complimentary JFET Diff input & JFET ouput USAcircuits Vendor's Bazaar 12 21st June 2011 11:02 AM
A chopped Mini-A with Jfet input stage Fuling Pass Labs 12 15th November 2006 07:45 PM


New To Site? Need Help?

All times are GMT. The time now is 06:14 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright ©1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2