Home OTL Asylum

OTL, Output Transformerless Amplifier User Group.

RE: another M60 bias question

The bias on the amp is mostly determined by the voltage on the grid of the power tubes. This means that usually you can remove power tubes without having to readjust the bias. Since you are using 6336s though, the current that they draw from the power supply is significant, twice that of the 6AS7Gs, so the power supply voltage will increase when they are removed. So you should check your bias to make sure they are OK.

The other thing I would do is de-rate the fuse by the power cord- with half the power tubes in the circuit it should be half the current rating. Its not a bad idea to do the same for the middle (filament) fuse as well.


This post is made possible by the generous support of people like you and our sponsors:
  K&K Audio / Lundahl Transformers   [ K&K Audio / Lundahl Transformers Forum ]


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.