jfet srpp preamp - 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 22nd June 2001, 01:39 AM   #1
diyAudio Member
 
Join Date: Feb 2001
Location: earth
Hello.
Does anyone know of any jfet-based srpp preamp?
I know this is very popular among tube amp fans,
I am considering building one.

Any pointers to tips/tricks and websites would be
highly appreciated.

Thanks in advance,
Yves
  Reply With Quote
Old 23rd June 2001, 12:39 AM   #2
diyAudio Member
 
Join Date: Jan 2001
Location: Scandinavia
Yves,

(is it Vidal?)

The reason for using SRPP is as I understand it the lack of positron tubes.

Why not consider something with p-channel devices instead?

Regardless of this, there is no reason why you should not replicate a tube SRPP with alternative devices.

Petter
  Reply With Quote
Old 23rd June 2001, 01:49 AM   #3
diyAudio Member
 
Join Date: Jun 2001
Location: Earth
Lightbulb SRPP

No, I don't think that's the reason for SRPP. Check out http://www.tubecad.com .. lotsa SRPP explanations..
  Reply With Quote
Old 23rd June 2001, 02:30 AM   #4
diyAudio Member
 
Join Date: Mar 2001
Location: Auburn, WA (somewhere between Seattle and Tacoma)
Blog Entries: 1
Send a message via ICQ to Damon Hill
Uhm, well, I have a Hafler SE100 preamp which is an
all-JFET design. Diff amp input and a complementary
output that appears to have a 2 uF coupling cap only
for turn-on DC transients. Does that fet the
description?

  Reply With Quote
Old 23rd June 2001, 11:07 PM   #5
lohk is offline lohk  Europe
diyAudio Member
 
lohk's Avatar
 
Join Date: Apr 2001
Location: Northern Noricum, near the Limes
You probably could mean Jack Orman's MINIBOOSTER (and it's derivates), which is basically a JFET SRPP schematic. You should find it at http://www.muzique.com/amz/ .
Mention: This amp is considered as a guitar preamp (with intended smooth distortion properties), so the values of the parts have to be changed somehow to fit it into the hifi world.
I can sent a little gif to you per mail, if you don't find it.

regards
Klaus
  Reply With Quote
Old 25th June 2001, 01:11 AM   #6
diyAudio Member
 
Join Date: Feb 2001
Location: earth
Default Re: jfet srpp preamp

Hello.

Thanks for all the responses.
The reason for the n-ch only amp is more an
experiment to gauge (at least for myself) if
jfets hv any tube-like properties as far as
audio is concerned. It is particularly attractive
because of it's flexibility with its use of -ve bias.
I was thinking of using it as an output buffer for
a dac.

p-ch jfets usually do not match all that identically with
n-ch devices, as with all other bjts, mosfets etc.
Plus, one can get dual matched jfets in a single
package.

Currently, my understanding leads me to
think that all the analysis for tube srpp amps
are applicable to jfets, with minor modifications.
Conclusions like optimum resistor loading,
mu followers, etc should be useable too.

Inputs appreciated, as always.

TIA,
Yves H (not Vidal)
  Reply With Quote
Old 7th February 2004, 01:21 PM   #7
diyAudio Member
 
Join Date: Sep 2003
Location: Copenhagen
Default SSRP JFET outputstage

Try to look here:

http://www.sugardas.lt/~igoramps/grass_preamp.htm

Isn't that exactly an SSRP outputstage?


- Peter
  Reply With Quote
Old 7th February 2004, 05:55 PM   #8
vuki is offline vuki  Croatia
diyAudio Member
 
vuki's Avatar
 
Join Date: Jun 2002
Location: zagreb, croatia
I think there is jfet SRPP phono preamp in new Elektor magazine.
  Reply With Quote
Old 23rd June 2012, 10:19 AM   #9
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
just tumbled over this old thread

sorry to 'reopen', but thought it looked.... hmm.....interesting
  Reply With Quote
Old 23rd June 2012, 11:09 AM   #10
diyAudio Member
 
Join Date: Mar 2006
Location: Outside Copenhagen
Quote:
Originally Posted by tinitus View Post
just tumbled over this old thread

sorry to 'reopen', but thought it looked.... hmm.....interesting
I think the mentioned thread is very secret
  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
JFET preamp? asc Chip Amps 6 10th May 2013 08:21 AM
JFET SRPP RIAA Preamp wrenchone Analogue Source 249 27th March 2013 11:20 PM
Help wanted on SRPP preamp jtcc1015 Tubes / Valves 8 29th November 2004 04:44 PM
Lowering gain in 12AX7 SRPP preamp net-david Tubes / Valves 26 23rd December 2003 05:55 PM
Preamp with 6sn7 & 6sl7 SRPP ??? Gregouille Tubes / Valves 4 18th June 2002 10:41 PM


New To Site? Need Help?

All times are GMT. The time now is 09:30 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