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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
"6V6 250V B+"
Posted By littlewyan on 04/24/2014
I'm looking to build myself a P1Extreme but with a few tweaks......

1. B+ will be 250VDC instead of 380VDC. This is because the 6V6 is rated at 4.5W Output when at 250VDC and its also down to Trans...

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"A2 and AB2 calculations and tone"
Posted By DanGu on 04/24/2014
ok. My question are essentialy 2 about these classes of operation, and hope pretty simple to get some answears

1. When a tube enters A2/AB2 how is affected the tone and how will the output waveform...

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"JTM45 clone startup problem"
Posted By ormen on 04/22/2014
Hi, first of all I want to apologize if this will be a lengthy post but I just want to make sure I explain the problem I have in the best possible way I can.

I just recently started to build a JTM...

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"Existing PT good enough?"
Posted By Dustin LeBlanc on 04/20/2014
Hey everyone, I am considering transforming my Blackheart Little Giant into a Comanchero. I am trying to do some cost estimating on the project to ball park what it will take monetarily before I decid...

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"Stand alone reverb!! Love this thing!!"
Posted By Zambo on 04/20/2014
Just built this and love it! Never had one or tried one but im a believer. Used the standard schematic for the g15 but instead of the 6k6 power tube I use...

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Updates: Thu, Apr 24th, 2014 @ 05:36:04
Updates to pages about


have been completed.
Site News

2012-2-25: Winter is almost over. What's on your workbench?

2011-10-10: Some good discussions about LTSpice in the forums again, as well as suggestions on what all to do to a P1-eXtreme.

2011-10-10: What all can you do with a P1-extreme? check the forum

2011-10-7: Don't forget to like us on Facebook!

2011-08-11: Posted some Single-Ended Lead clips in the Classic Amp Projects->SEL section. Hundreds built but now we've got clips. Check out the archived projects section for more clips.

2010-10-22: Be sure to check out our discussion forum using the link on the left..

2009-07-01: 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 (sales@dobermanamps.com).
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