The Starving Student was the first tube amp I ever wired point to point. Unfortunately those 19J6s are getting hard to find. Here's another spin on the same 48V tube+MOSFET buffer theme using a 7370 tube (5687 with 40V heaters). As tribute to Pete Millett, I'm calling it El Estudiante.
You can read more about the design, etc, on my project website here: https://wtfamps.wordpress.com/el-estudiante-headphone-amp/
No commercial interest. Just giving back to the community that first convinced me to jump into the tube audio pool and learn to swim.
Now quick jump on eBay and grab some 7370s while they're still $5 a piece!