Home Tube DIY Asylum

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

Separate Cathode Rs for PSE

Andy, the advantage of separate Cathode Rs is that you can use these to balance the idle currents. Also, if you choose to trade off the slightly better technical performance afforded by bypassing (all or part of each) then you will gain better AC signal matching.

Personally, I'm not a fan of 100% Cathode Biasing. In my 845PSE monos I use (mainly) fixed biasing through Pos and Neg PSUs and just enough Cathode Biasing via adjustable Rs to balance idle current of each tube. I use DC coupling and my main (coarse) control for idle current is via adjustment of the DC grid voltage, set in the driver stage.

Happy to share if can be bothered with the additional complexity. Advantages are A2 drive on peaks, DC coupling and great balance.

Cheers,
Naz


This post is made possible by the generous support of people like you and our sponsors:
  Analog Engineering Associates  


Follow Ups Full Thread
Follow Ups

FAQ

Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Subject:
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.