Account Info
Greetings, Guest.

Reset Password
Create New Account

Browser cookies are required for these functions.

Welcome to AX84® the base camp for tube (valve) electronics hobbyists.

AX84 exists to provide:

1) A great environment to learn about music-related electronics in general. AX84 is a place where those with experience are interested in helping diligent beginners who are willing to do their homework.

2) A place where those with more experience can field their ideas to peers and get useful feedback.

3) An environment that respects the past, but is not enslaved by it. INNOVATION IS GOOD (and it didn't die in the 1950s.) There are new things under the sun every day. Move the ball forward!

Our HUGE discussion area is under 'Discussion Forum' to your left.

We are hard at work improving the site- check back often!

Recent Forum Threads
"bias circuit for EL84's?"
Posted By Alva Goldbook on 03/04/2015
I've noticed that there's some people who really dislike EL84's, and the thought occurred to me, that maybe the reason why is because I can't recall any amp where EL84's weren't cathode biased. so I'm...

Discuss this entry
"Resistor and/or Capacitor Packs"
Posted By lkrasner on 03/04/2015
It's getting a bit annoying to order individual resistors for each build. They may be cheap, but it sill seems like it would be cheaper after a few builds to just buy a nice kit. Plus, experimenting w...

Discuss this entry
"Interest in PCB amp designs"
Posted By Ben Sykora on 03/04/2015
I have been considering a new amp build this year that utilizes PCB instead of hand wiring. Keeping with previous experience, the plan is to use PCB Artist, which is offered by Advanced Circuits (4pc...

Discuss this entry
"Looking into a Carmen Ghia Build"
Posted By BrentTraps on 03/04/2015

So it's been a while and the building bug has struck again.

I'm looking into a Carmen Ghia build and need some advice/opinions. Overall, I am looking for suggestions for transformers and s...

Discuss this entry
"Crossover distortion at all power levels"
Posted By foulowl on 03/03/2015
Hi folks,

Seeing this output from my 8 ohm tap at all power levels:

Function generator is running at 4 khz, but same problem at 400 hz as well. Output from PI is ...

Discuss this entry
Like us and Find us

Subscribe to me on YouTube

Site News

2014-10-21: Be sure to check out our discussion forum using the link on the left..

2014-10-20: The Treasure Fleet is on the way to Rio De La Hacha with a fortune in gold!

We're looking for media clips of recent builds... please stop by the forum and respond to the thread.

2008-10-4: Archived Projects section is functional again.

2008-9-18: RSS Feeds for the forum have been up for a while, but not advertised...
* Active Threads
* New Threads
* Recent Posts

2008-6-26: Want to participate in our discussion forums? You are welcome to read and lurk as you like. If you think you'd like to post with regularity, please sign up for an account.

AX84® is a registered trademark of Doberman Music Products, LLC. AX84.COM content may not be reproduced without the express written consent of Doberman Music Products, LLC (
For information about using the AX84® trademark, project names and designs, click here