Home Tube DIY Asylum

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

RE: Filament bias

The 'old' data sheets are accurate. The curves usually refer to the midpoint of the filament and are taken with AC filament. If you apply DC filament voltage and raise it with a filament bias resistor to 5V, your actual bias is more like - 8.75V.

Anyways there are tolerances between tubes so not every tube sample will bias down to the same exact mA value at the same op point



This post is made possible by the generous support of people like you and our sponsors:
  Herbie's Audio Lab  

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.