Jump to content
  • 0

Another Bias Question


according to this http://line6.com/supportarchivenew/thread/75238




multimeter to DCV 200m


AB mode and you should get a reading close to 25.0. If it's off, turn the adjustment screw with a small screwdriver until it is at 25 +- 3




Like one guy in previous post I'd like to try JJ el844 who have 25% less power cause my DT25 is still very loud.


Should I bias -25% (18.75) like I read on other amp site or I stay at 25?



  • Downvote 1

Share this post

Link to post
Share on other sites

6 answers to this question

Recommended Posts

  • 0

Take care as EL844 may not cathode bias correctly in Class A mode. As I recall it may require a resistor swap in that case.

Share this post

Link to post
Share on other sites
  • 0

Use the specified valves from EH. That's what these amps are designed for.

These amps are not like the all analog amps of the 1960's and 70's. They are

not forgiving of modifications, or even of valves.


The difference in the characteristic curve between valve brands can cause problems.

This is not an all analog amp, the digital and analog sections have expectations of

one another. Mess with that and problems occur.


Use the specified EH valves.


Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now