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 NEW  Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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PostPosted: 12 Apr 2010, 16:20 
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Please feel free to ask your questions and post comments about the NP-100v12: DIY 12AU7 (ECC82) Tube / IRF510 MOSFET Headphone Amplifier project in this thread.

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PROJECT LINK - NP-100v12: DIY 12AU7 (ECC82) Tube / IRF510 MOSFET Headphone Amplifier


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Additional information for the NP-100v12 - 12AU7 / IRF510 HeadAmp


Finished Amplifier Photos

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PostPosted: 13 Apr 2010, 10:45 
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Joined: 13 Apr 2010, 10:39
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Location: Dallas, Texas, USA
Very nice project. It's a nice convenience that it runs at 12V (13.8 nominal?).

I wonder if there is any advantage to running the tube plate at a higher voltage?

What is the gain of this project?
I've built the Millet Max and usually keep it on my desk at work - I wonder how this project compares; I certainly have some 12AU7's in my lil' tube inventory.

Mike Y
KM5Z
Dallas, Texas


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PostPosted: 13 Apr 2010, 12:14 
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Hi Mike, welcome to the forum.

For purpose of the NP-100v12 the 12AU7 tube will be used in a common cathode configuration, and the incoming signal will be amplified by approximately 10dB.

10dB is ~ 3 times.

Yes, you can achieve better linearity at higher voltage, but that is a completely different beast that will require a high voltage power supply.
Cheers

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PostPosted: 13 Apr 2010, 19:06 
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Location: Denver, Colorado
You can probably build this amp with the leftover parts from your millet build. I know when I order from mouser of digikey I always order extra stuff. Not sure if you have experience etching, but this project is a great way to learn.

The project is designed for those who want to get into tubes, but are either cautious with high voltage, or maybe looking for something to build after a cmoy. It makes a great amp for listening to the computer at night.

Have fun

Rogers


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PostPosted: 14 Apr 2010, 23:36 
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Location: Dallas, Texas, USA
Swell!
I came home from work and found a suitable project box and now I'm kitting it up now.
Hopefully I'll have another version of it up by this weekend.

The Millet-Max works fine, but I'm always up for testing out and playing with new projects.

I'm thinking of adding the few extra components to provide a power-on delay (20 to 30 seconds).
Would that be a useful addition?

Mike Y
roggom wrote:
You can probably build this amp with the leftover parts from your millet build. I know when I order from mouser of digikey I always order extra stuff. Not sure if you have experience etching, but this project is a great way to learn.

The project is designed for those who want to get into tubes, but are either cautious with high voltage, or maybe looking for something to build after a cmoy. It makes a great amp for listening to the computer at night.


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PostPosted: 14 Apr 2010, 23:52 
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Location: Denver, Colorado
Yes, I actually have a delay circuit stuffed in mine, it is about 3 seconds and then makes the headphone contacts. It is based on AMB's E12 circuit but only for +12v not +/- 12. viewtopic.php?f=10&t=1480

The schematic can be opened with expresssch http://www.expresspcb.com/ExpressPCBHtm ... ftware.htm


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PostPosted: 15 Apr 2010, 00:00 
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Joined: 13 Apr 2010, 10:39
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Location: Dallas, Texas, USA
Exactly the one - eh, I pulled the schematic from:

http://diyforums.org/MAX/MAXe12.php

Probably can be done more simply, but I have the parts (or substitutes) and it's quite bulletproof.

Mike Y

roggom wrote:
Yes, I actually have a delay circuit stuffed in mine, it is about 3 seconds and then makes the headphone contacts. It is based on AMB's E12 circuit but only for +12v not +/- 12. viewtopic.php?f=10&t=1480

The schematic can be opened with expresssch http://www.expresspcb.com/ExpressPCBHtm ... ftware.htm


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PostPosted: 15 Apr 2010, 14:23 
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Joined: 31 Dec 2008, 15:34
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Location: Denmark
Hi Forum

To the Head-fi DIY people, build this one, you'll be very pleased. :headphones: I've got ver. NP-100v12 runing ( tested ) for a while and must say i'm really satisfied with the sound. One of the important things in this amp. is the CCS. :lightbuilb:

Applaus to Mr. Gomez ...you've done it again, thanks. :thumbsup:

Thanks to both Mr. Gomez and Gio, for a very detailed presentation, good work. :up:

Instead of 12AU7, i've used 6J5GT tubes, simply because iv'e got a dusin of these. :sleep: http://img219.imageshack.us/img219/2945/42637013.jpg

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PostPosted: 16 Apr 2010, 09:08 
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Location: Denver, Colorado
John,
Thanks for the kind words, your amp looks nice. I like the use of the larger tubes. It will be neat to see how many variations this project can take. I am sure it will come out wonderful

Rogers


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PostPosted: 16 Apr 2010, 20:27 
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Joined: 16 Apr 2010, 19:51
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I'm pretty interested on building one. i have two questions:
1) can i power it from a regulated 24V supply?, any modifications needed?
2) How's the sound? any comparison points?

cheers!


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