Guitar preamp for LM3886

Mnvizb · 3rd December 2011, 04:00 PM

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!

tinitus · 3rd December 2011, 04:10 PM

Quote:

Originally Posted by Mnvizb

but I want at least variable gain

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

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look up effect pedal curcuits

nigelb001 · 3rd December 2011, 04:30 PM

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

indianajo · 3rd December 2011, 06:27 PM

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.

tinitus · 3rd December 2011, 10:58 PM

Quote:

Originally Posted by nigelb001

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

i2k92 · 11:28 PM

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)

Printer2 · 4th December 2011, 03:26 AM

I personally like the Professor Tweed or the Eighteen.

Articles and Schematics

Mnvizb · 08:51 AM

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?

pinkmouse · 4th December 2011, 08:38 AM

I'll second the GT2 clone, I built one to use 'till I get the funds to build my all valve fleawatt jobbie.

Printer2 · 4th December 2011, 09:11 PM

Quote:

Originally Posted by Mnvizb

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.

3rd December 2011, 04:00 PM	#1
Mnvizb diyAudio Member Join Date: Nov 2011	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!

3rd December 2011, 06:27 PM	#4
indianajo diyAudio Member 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,SP2-XT's, T-300 HF Projs, Steinway console, Herald RA88a mixer, Wurlitzer 4500

3rd December 2011, 11:24 PM	#6
i2k92 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.

4th December 2011, 08:28 AM	#8
Mnvizb 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.

4th December 2011, 08:38 AM	#9
pinkmouse diyAudio Moderator 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. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort


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3rd December 2011, 04:30 PM	#3
nigelb001 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

4th December 2011, 03:26 AM	#7
Printer2 diyAudio Member Join Date: Apr 2010	I personally like the Professor Tweed or the Eighteen. Articles and Schematics

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