12AT7 Pre-amp schematic, where to find?

Anaksulnamun · 16th September 2005, 02:54 PM

Good day bros, I'm a newbie at DIY and I just got a bunch of 12AT7 tubes

.And I want to make a pre-ampli using those tubes ...but I dont know how to start ...

so.. would you like to helo me with a shematic bros

?it will be such a great favor for me. If I have to use another tube, I think I can afford this on my pre-amp

Thank you for help

Miniwatt · 16th September 2005, 03:46 PM

If you want a good-sounding preamp I would use other tubes, 12AT7

SY · 16th September 2005, 05:09 PM

Quote:

Originally posted by Miniwatt
If you want a good-sounding preamp I would use other tubes, 12AT7

12AT7s have very low distortion in a competent circuit, quite comparable in magnitude and distribution to 6SL7.

Anaksulnamun · 16th September 2005, 07:53 PM

Yeah, so could you reccomend me a schema ?

SY · 16th September 2005, 08:09 PM

You've not been terribly clear about what you want to do, other than "preamp." Line? Phono? Input and output impedances? Gain?

amperex · 16th September 2005, 09:09 PM

I understand the Genelex A2900 is perhaps the only good sounding 12AT7. I would select another tube. How about a 6P5GT or 76 tube based preamp?

Geek · 17th September 2005, 01:48 AM

The 12AT7 guru had some great circuits

http://dogstar.dantimax.dk/tubestuf/instpre.htm

Anaksulnamun · 17th September 2005, 07:52 PM

Quote:

Originally posted by SY
You've not been terribly clear about what you want to do, other than "preamp." Line? Phono? Input and output impedances? Gain?

Wao, thank Geek, I sure will have give this a try

.Yeah, I'm not so clear (as I said b4,I just a newbie

).I want a line pre-amp

Gain should be between +- 10dB

and Input and output impedances will not be a matter for me

Thank Geek for help, and in this shema, can I prelace all tubes with my 12AT7 tubes (cuz it's damned expensive for tubes here) ,but if not...why not pay a litle more for DIY audio,

right my dear friends ?

DirkD · 18th September 2005, 09:32 AM

Hi there

I built a clone of the Conrad Johnson PV10 which I later modified to a PV10A. I built it as a linestage and it does sound very good, despite all the critisism of 12AT7 tubes. Here is a link to a site with all the required schematics. Please contact me if you require the board layouts. Some parts are obsolete, but you can build it with a simpler power supply.

Regards

Dirk

http://w3.uniroma1.it/chemo/attivita/CJpv10.html

kmtang · 18th September 2005, 11:09 AM

I believe Conrad Johnson's PV10 should be a good performance. I found that the Power Supply contribute large effect on the sound as well.

I built similar line amp with 6SN7 and I like to run it with C-L-C-L-C filter in the power supply. It provide very fine details and dead quiet background.

Johnny

16th September 2005, 02:54 PM	#1
Anaksulnamun diyAudio Member Join Date: Sep 2005	12AT7 Pre-apm schematic, where to find? Good day bros, I'm a newbie at DIY and I just got a bunch of 12AT7 tubes .And I want to make a pre-ampli using those tubes ...but I dont know how to start ... so.. would you like to helo me with a shematic bros ?it will be such a great favor for me. If I have to use another tube, I think I can afford this on my pre-amp Thank you for help

16th September 2005, 08:09 PM	#5
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	You've not been terribly clear about what you want to do, other than "preamp." Line? Phono? Input and output impedances? Gain? __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

16th September 2005, 09:09 PM	#6
amperex diyAudio Member Join Date: Feb 2005 Location: MI	Genelex A2900 (12AT7) I understand the Genelex A2900 is perhaps the only good sounding 12AT7. I would select another tube. How about a 6P5GT or 76 tube based preamp?

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16th September 2005, 03:46 PM	#2
Miniwatt diyAudio Member Join Date: Nov 2004 Location: Den Haag	If you want a good-sounding preamp I would use other tubes, 12AT7

16th September 2005, 07:53 PM	#4
Anaksulnamun diyAudio Member Join Date: Sep 2005	Yeah, so could you reccomend me a schema ?

17th September 2005, 01:48 AM	#7
Geek diyAudio Member Join Date: Sep 2004	The 12AT7 guru had some great circuits http://dogstar.dantimax.dk/tubestuf/instpre.htm

18th September 2005, 09:32 AM	#9
DirkD diyAudio Member Join Date: May 2004 Location: Paarl, South africa	Hi there I built a clone of the Conrad Johnson PV10 which I later modified to a PV10A. I built it as a linestage and it does sound very good, despite all the critisism of 12AT7 tubes. Here is a link to a site with all the required schematics. Please contact me if you require the board layouts. Some parts are obsolete, but you can build it with a simpler power supply. Regards Dirk http://w3.uniroma1.it/chemo/attivita/CJpv10.html

18th September 2005, 11:09 AM	#10
kmtang diyAudio Member Join Date: Nov 2004 Location: Vancouver	I believe Conrad Johnson's PV10 should be a good performance. I found that the Power Supply contribute large effect on the sound as well. I built similar line amp with 6SN7 and I like to run it with C-L-C-L-C filter in the power supply. It provide very fine details and dead quiet background. Johnny

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