The author describes the construction of a very simple single-ended, single-stage, single-tube (SESS) tube headphone amplifier with a reference power supply that uses a tube rectifier in a hybrid Graetz bridge configuration.
http://headwize.com/projects/showfile.php?file=ciuff4_prj.htm
This OTL design features a high-voltage power supply that is less than half of the one used in the author's first amp and most other tube amps, but without compromising performance.
http://headwize.com/projects/showfile.php?file=ahammer2_prj.htm
Features a series regulated push-pull input stage and transformer-coupled output stage with an output impedance of about 2.5 ohms. It has zero global feedback for open, natural sound without any harshness.
http://headwize.com/projects/showfile.php?file=busbridge_prj.htm
this version uses a Raytheon 5842 at the input and a new power supply with tube rectifiers.
http://headwize.com/projects/showfile.php?file=ciuff2_prj.htm
This transformer-coupled design uses a series regulated push-pull input stage and a parallel-triode cathode bias output stage. The audio output transformer is hand-wound from a kit. The amp will drive both headphones and speakers.
http://headwize.com/projects/showfile.php?file=frazer_prj.htm
This version of the optimized Morgan Jones headphone amplifier uses 6N1P dual triode tubes and a standard power supply. The author provides extensive construction details. Includes simulation files for use with OrCAD Lite software.
http://headwize.com/projects/showfile.php?file=bender_prj.htm
A simple OTL design that uses just two tubes (dual triodes) for stereo. It has a common cathode input stage direct-coupled to a cathode follower output stage.
http://headwize.com/projects/showfile.php?file=waarde1_prj.htm
Two electrostatic headphone driver designs: the second is DC-coupled and uses high voltage Apex op-amps as DC regulators.
http://headwize.com/projects/showfile.php?file=gilmore_prj.htm