Ah, nothing like the sweet sound of good headphones, up close and personal with the best of both worlds – a 12AU7 tube front end with dual IRF510 power MOSFETs as the drivers. Elegant sound that packs a punch, and it runs on 12 volts to boot.
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Based on the NP-100v12, a portable combo tube/semiconductor headphone amp designed by Rogers Gomez, the mini-circuit board and low voltage design means it can travel in a backpack. I built mine in a little wooden tea box, refinished in a red mahogany laquer with the innards assembled within.
It was a great idea and looked real cool, but it was anything but cool. Gomez states that the amplifier can run without heatsinks, but in a closed small container, it heated up real fast. Lots of thermal noise and components overheating.
So enough of that. I don’t really need a backpack headamp. What I need is a desktop unit. So my final version III was built in an old modem case, with the lid off.
You can view the original project page over at DIY Audio Projects here: http://diyaudioprojects.com/Solid/12AU7-IRF510-LM317-Headamp/.
If you’re interested in this or any of our other products or services, please contact Duncan McAllister at Nebulix Digital Media for a consultation or quotation at firstname.lastname@example.org