After quite a few requests, I finally designed a balanced (truly differential) headphone amp / line amp using the Korg Nutube. You can find details on my web site: http://www.pmillett.com/Nutube_bal.html It is a true differential amp, with the dual triode sitting on a CCS tail as a diff...

  I just published the design of a DIY hybrid headphone amp using the new Korg Nutube 6P1.   It's a lot like the original "Millett Hybrid" that I published 15 years ago.  Instead of an old car radio tube, though, this one uses the new Korg Nutube.  The Nutube has been popular with DIYers in...

    People have asked me for a DIY tube headphone amp design that will drive small speakers (like computer speakers) for quite a while.  I just posted such a design, called "Jonokuchi" (Jonokuchi refers to the beginner ranking of sumo wrestlers).   Details are here:  ...

    I've had a number of people ask me to make the DC filament supply boards I made for an earlier project available. I've finally gotten around to it... http://www.pmillett.com/DC_filament_supply.htm You can use these to provide DC power to a tube filament or heater, or you can...

I've been discussing this in the DIYAudio tubes forum, but figured some headphone geeks might be interested... I designed a DIY interface to a sound card that makes it a little easier to use the PC as a piece of audio test equipment. Details are here: Soundcard Interface ...and the...

I just posted the design details of the Millett "Starving Student" hybrid amp on my website: Starving Student hybrid Think "Millett Max" for the financially impaired... or maybe "Millett Min"? The idea was to design the simplest, lowest cost hybrid headphone amp possible. It still had...

I'm curious - all you builders out there: what series resistor, if any, do you use on the output of your headphone amps? This would be the resistor between the headphone (jack) and the output buffer of your amp. This really applies only to amps with a solid-state output buffer (opamp, BUF634...

With all the traffic I've been getting from people downloading the books I've been scanning, I had to move my web site to a different provider. So now it's at a new URL: www.pmillett.com. Please readjust your bookmarks... No more bandwidth limits! Pete