Guitar preamp for LM3886 - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

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 3rd December 2011, 04:00 PM   #1
Mnvizb is offline Mnvizb  Lithuania
diyAudio Member
 
Join Date: Nov 2011
Default Guitar preamp for LM3886

Hello guys, I have just finished my LM3886 chipamp and since I am going to use this as guitar amp I will need a preamp stage. I thought about preamp using 12AX7, but I don't have money for it. Could you recommend me any simple preamp. I thought about this one Discrete FET Guitar Preamp
but I want at least variable gain (to get Overdrive). Thanks!
  Reply With Quote
Old 3rd December 2011, 04:10 PM   #2
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by Mnvizb View Post
but I want at least variable gain

(to get Overdrive).
-------------------

[/URL]
look up effect pedal curcuits
  Reply With Quote
Old 3rd December 2011, 04:30 PM   #3
diyAudio Member
 
Join Date: May 2011
No good. That's only got 3dB of gain, and do you only want clean, where's your overdrive coming from?

Tube preamp of some sort will give the best sound but otherwise something like the preamp section in this article may do it. I just googled and it was there!

Guitar amp project
  Reply With Quote
Old 3rd December 2011, 06:27 PM   #4
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
Tonepad.com has some naked PCB op amp projects. He sells PCB's, so buy your components locally. Don't use 741, use a pin compatible TL082 or 4558 or something.
I have found some tube 10W Bogan or David PA amps at the charity resale shop. The output transformers of these are garbage, but the LM3886 will replace that. The Bogen etc. power supply transformer and case are okay, All electrolytic caps will have to be replaced of course.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300
  Reply With Quote
Old 3rd December 2011, 10:58 PM   #5
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by nigelb001 View Post
No good. That's only got 3dB of gain, and do you only want clean, where's your overdrive coming from?
I have listened to some pretty impressive overdrive from a 1watt tube head
  Reply With Quote
Old 3rd December 2011, 11:24 PM   #6
i2k92 is offline i2k92  Indonesia
diyAudio Member
 
Join Date: Mar 2005
Location: Indonesia
The Tilman JFET preamp you mentioned will not get any overdrive/distortion.
I had Damage Control tube preamp years ago and IMHO the tubes are just gimmicks. From practical point of view I still prefer opamp based preamp like Sansamp GT2 and some other JFET based preamps. Go here for some good guitar preamps / simulators :
www.tonepad.com (sansamp GT2, one of the most famous preamp)
www.runoffgroove.com (JFET preamps derived from some famous guitar amps)

Last edited by i2k92; 3rd December 2011 at 11:28 PM.
  Reply With Quote
Old 4th December 2011, 03:26 AM   #7
diyAudio Member
 
Join Date: Apr 2010
I personally like the Professor Tweed or the Eighteen.

Articles and Schematics
  Reply With Quote
Old 4th December 2011, 08:28 AM   #8
Mnvizb is offline Mnvizb  Lithuania
diyAudio Member
 
Join Date: Nov 2011
I am currently looking at Professor Tweed, It is appealing to me that it reproduces that tweedy sound since I love blues, but i wonder If it can used as as preamp or just pedal. I mean when i would set his gain low for clean signal. Or does it need another preamp after it?

Last edited by Mnvizb; 4th December 2011 at 08:51 AM.
  Reply With Quote
Old 4th December 2011, 08:38 AM   #9
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
I'll second the GT2 clone, I built one to use 'till I get the funds to build my all valve fleawatt jobbie.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 4th December 2011, 09:11 PM   #10
diyAudio Member
 
Join Date: Apr 2010
Quote:
Originally Posted by Mnvizb View Post
I am currently looking at Professor Tweed, It is appealing to me that it reproduces that tweedy sound since I love blues, but i wonder If it can used as as preamp or just pedal. I mean when i would set his gain low for clean signal. Or does it need another preamp after it?
I think it should work well without another preamp.
  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
LM3886 Bass guitar amp docz Chip Amps 17 12th October 2010 11:02 AM
lm3886 building as guitar amp umut1001 Chip Amps 9 27th April 2008 08:06 PM
Guitar Preamp = MIC Preamp = other preamp ,,are they all same? Paswa Solid State 1 12th March 2008 05:16 PM
lm3886 guitar amp? etec_noob Chip Amps 22 7th December 2007 05:14 AM
Problem with LM3886 guitar amp??? Minion Chip Amps 4 2nd November 2006 04:39 PM


New To Site? Need Help?

All times are GMT. The time now is 10:45 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