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My take on the Starving Student (El Estudiante)

post #1 of 3
Thread Starter 

 

 

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!

post #2 of 3

Those tubes don't look too linear with such a low B+. I think it would be cool to try a 6BF7 (datasheet) But if it sounds good, then there's no real problem.

 

BTW I love your website! It is the best place on the web for learning the basics of tube audio amp design IMO. I am one person who you demystified tube amps for. Keep up the good work!

post #3 of 3
Thread Starter 
Thanks for your kind words, 100volttube.

Truth is there's very little short of space charge tubes that is going to be linear at 48v B+. From just looking at plate curves though, the 5687 does much better than most.

Well enough that a 3x Rp load will let the grid bias negative with a couple ma current through it. A lot of other tubes need extremely large loads and miniscule current to pull it off.

I'd be very interested to try the same amp with a choke load like the Hammond 156C, but that about doubles the cost and makes it a conceptually more advanced amplifier.

edit to show actual bias point:


Edited by Sodacose - 3/7/17 at 7:52am
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