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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
"parts for amps build."
Posted By Elbert Elrod on 11/20/2014
Need help! would an early 60's Lowrey organ be a good source of parts for a tube amp build? I found one that is in working condition for $50, with internal speakers. ...

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"b9a Prototyping board"
Posted By Chris Hurley on 11/20/2014
Merlin was gracious enough to allow me to have some of his awesome 9-pin prototyping boards made. They have arrived and if anyone in the USA is interested in getting one or more, let me know.


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"New High Pitch Squeal-Help!"
Posted By Eric Nelson on 11/19/2014
I stored my Firefly in the attic while out of town for about two months this summer and when I got it down and played through it it had a high pitched squeal that I've never heard before. The amp is ...

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"Bias setting for 2W SE power amp"
Posted By Greg Smith on 11/19/2014
I am finishing up a small amp build using the 2W SE power amp design from this site. I'm a bit puzzled by the plate dissipation ratings for the 6SN7 tube. Datasheets indicate a 5W max dissipation for ...

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"mic preamp hum"
Posted By DanGu on 11/18/2014
Hi. i've finished a tube mic preamp for a friend who has to record some tracks. But testing it we noticed that the mic inputs have to much hum for recording purpose.
Here the schematic of the input g...

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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...
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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 (sales@dobermanamps.com).
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