Masterpiece - Page 61 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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 28th March 2013, 03:52 AM   #601
diyAudio Member
 
Stefanoo's Avatar
 
Join Date: Apr 2006
Location: italia - ora USA -WI
Quote:
Originally Posted by Joachim Gerhard View Post
Yes, i build it and others. Here in the german DIY scene it even is a bit famous.
It won several contests.
The " Hawksford" connection has a positive influence on the sound in the bass my sources told me.
Did you build it with 8 pairs of Jfets?
What would the reason be for having so many paralled Jfets?

Do you think there is a true sonic benefit from having so many paralleled devices?
I am wondering if to drive a regular premplifier, which in the worse case could present 20-30Kohm of impedance we require an output stage capable of 40-50mA?
__________________
Stefano
  Reply With Quote
Old 28th March 2013, 03:57 AM   #602
diyAudio Member
 
Stefanoo's Avatar
 
Join Date: Apr 2006
Location: italia - ora USA -WI
I will post here the buffer Joachim is referring to.
Attached Files
File Type: pdf Hawksford Buffer.pdf (92.6 KB, 60 views)
__________________
Stefano
  Reply With Quote
Old 28th March 2013, 08:41 AM   #603
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Buffers are one of my hobbys you know so at the beginning of the MPP thread i published a lot of buffers and several people build various versions. The buffer you just posted won the listening contest.
This is now more then 2 years agao.
Yes, i build it with 5 pairs of Fets in parallel.
Do i think that this sounds better then only one pair ?
That depends on how much current we draw.
By the way i find the Paradise buffer transparent in most cases and as good as the
Hawksford.
  Reply With Quote
Old 28th March 2013, 09:05 AM   #604
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
dadod has just posted an improved version of the buffer.
I will try this out.
  Reply With Quote
Old 28th March 2013, 09:53 AM   #605
diyAudio Member
 
Bksabath's Avatar
 
Join Date: Dec 2007
Quote:
Originally Posted by MiiB View Post
hmm... Gain is a question of scaling the riaa ccomponets, I have a Paradise with Jfet input and 65dB gain at 1Khz. 2 set in parallel each running at 7 mA
Wuld it be possible to try this out Please?

PM maybe...
  Reply With Quote
Old 28th March 2013, 01:56 PM   #606
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Quote:
Originally Posted by Stefanoo View Post
so many paralled Jfets?
It's either noise level, multiplying transconductance, or stacking current.
A buffer with high drive capability is never a bad thing, ime, even for phono duty (inbalance percentage of a V8 versus a 2-cylinder four-stroke)

Eight in parallel would be totally unstable, only works with BJT's.
(Accuphase manages 3 parallel J108/K370)
__________________
The buck stops Here
  Reply With Quote
Old 28th March 2013, 05:28 PM   #607
diyAudio Member
 
Stefanoo's Avatar
 
Join Date: Apr 2006
Location: italia - ora USA -WI
Interesting! I guess I will have try try it!
__________________
Stefano
  Reply With Quote
Old 28th March 2013, 06:04 PM   #608
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Elementary, a buffer only has local feedback.
__________________
The buck stops Here
  Reply With Quote
Old 28th March 2013, 09:40 PM   #609
diyAudio Member
 
Stefanoo's Avatar
 
Join Date: Apr 2006
Location: italia - ora USA -WI
quoting from the other post:

John seems to like the type "A" circuit:
http://www.diyaudio.com/forums/analo...ml#post3431096
__________________
Stefano
  Reply With Quote
Old 28th March 2013, 10:50 PM   #610
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
There's just one little problem with it.
__________________
The buck stops Here
  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
Lyra Connoisseur 4-2L SE: What a masterpiece! Sigurd Ruschkow Solid State 56 18th April 2013 08:23 PM
A new masterpiece to add to the family... Guiness Tubes / Valves 20 2nd May 2003 08:37 PM


New To Site? Need Help?

All times are GMT. The time now is 02:58 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2