Home Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

RE: how to remove feedback loops

each of the output tubes need their screen tied to the plate through a 100 ohm resistor. currently the screens are tied directly to b+. this will triode strap the output stage and reduce the need for feedback.

next remove the global feedback loop from the secondary of the output transformer to the cathode of the driver tube. you should also remove the switch and combine the 3 resistors into one. you may want to bypass that resistor with a capacitor also - or try it both ways. without a capacitor on the cathode you will introduce degenerative feedback and reduce gain. good luck!

This post is made possible by the generous support of people like you and our sponsors:
  Audio Hoarder  

Follow Ups Full Thread
Follow Ups


Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.