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Old 16th September 2005, 02:54 PM   #1
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Default 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
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Old 16th September 2005, 03:46 PM   #2
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If you want a good-sounding preamp I would use other tubes, 12AT7
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Old 16th September 2005, 05:09 PM   #3
SY is offline SY  United States
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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.
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Old 16th September 2005, 07:53 PM   #4
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Yeah, so could you reccomend me a schema ?
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Old 16th September 2005, 08:09 PM   #5
SY is offline SY  United States
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You've not been terribly clear about what you want to do, other than "preamp." Line? Phono? Input and output impedances? Gain?
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Old 16th September 2005, 09:09 PM   #6
amperex is offline amperex  United States
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Default 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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Old 17th September 2005, 01:48 AM   #7
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The 12AT7 guru had some great circuits

http://dogstar.dantimax.dk/tubestuf/instpre.htm
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Old 17th September 2005, 07:52 PM   #8
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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 ?
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Old 18th September 2005, 09:32 AM   #9
DirkD is offline DirkD  South Africa
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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
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Old 18th September 2005, 11:09 AM   #10
kmtang is offline kmtang  Canada
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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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