Home SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: Using fixed bias on a 6J5G

Most will use a battery in this position to provide negative bias. The problem with using a power supply derived fixed bias on a driver tube is that there is a lot of gain so any noise gets amplified, very small changes in the voltage 0.1 v will have an impact on bias versus the wider tolerance for output tubes. This can lead to a signal compression. You could use a small volt reg, but that will have an impact.

It is possible, but you will need a cap on the grid of the tube so your negative bias voltage does not go upstream. Usually the cap offsets any advantage of fixed bias when resistors or diodes are pretty capable.


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


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.