collapse

Author Topic: Hybrid valve and TPA311x  (Read 948 times)

jfetter

  • Regular
  • **
  • Posts: 47
  • Chip Points: 20
    • View Profile
Hybrid valve and TPA311x
« on: November 15, 2018, 07:52:42 PM »
Two years have tested others and this one sounds the best.
 I built it point to point but now doing a board.
The tone tilt I think beats all others. Shown here in hifi mode but easy to add scoop.
Uses 12AU7 and $3.00 D class module.

Schematic attached. The fx loop is not fully tested.
Cheers



jfetter

  • Regular
  • **
  • Posts: 47
  • Chip Points: 20
    • View Profile
Re: Hybrid valve and TPA311x
« Reply #1 on: September 13, 2019, 03:29:50 PM »
A reliable pcb pot (ie Beckman ) cost quite a lot. So I put a servo-buffer opamp and configured as a ' super triode' . It took a long time to get it right...
This plot is using a sa5532 with 6sn7 in feedback loop.

It's raw right now in fact going to a lower gain tube but the plot shows 1khz signal , 2 khz dominant harmonic , 4th etc.
Third and fifth very low.


 

* User Controls

 
 
Welcome, Guest. Please login or register.
Did you miss your activation email?

* Recent Posts

signal tracing by Crich
[Today at 10:34:07 PM]


Eight Audio Kit TDA7294 and TDA2050 from India by Enzo
[December 05, 2019, 08:10:57 PM]


The Dangers of Speaker Impedance Mismatching by Enzo
[December 05, 2019, 11:44:14 AM]


Gallien Kruger GT200 by gbono
[December 04, 2019, 02:54:12 PM]


Peavey Classic VT by Enzo
[December 02, 2019, 09:16:10 PM]

* Sponsors