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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
"schematic for 8 to 12 watt class A EL84 amp"
Posted By David Ray on 08/30/2014
I have a Laney LC-15R chassis complete with the power and output transformers still mounted. The main circuit board is trashed because of one of the plastic EL-84 sockets arching and Charing the board...

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"KT120 Driver"
Posted By tooltime on 08/29/2014
I'm designing a bass amp with a push-pull quartet of KT120's. I was wondering if anyone has experience with these tubes, and what was used to drive them.

-Would an ECC99 or 12BH7 as an LTPI be a g...

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"New Vishay MKP 20uF & 30uF 700V low profile film caps"
Posted By CChurchill on 08/27/2014
for sale:
Brand new Vishay metalized polypropylene film capacitors in the following values:


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"5 Watt Carbon Film resistors 20uF 100V film Cathode Bypass cap"
Posted By CChurchill on 08/27/2014
for sale:
New Cornell Dubliner 20uF Metalized Polypropylene 100v capacitors - axial leads. great for cathode bypass. I have 3 I can sell for $10 a piece

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"Bone ray tone stack question"
Posted By reverberocket on 08/25/2014
Hello guys
Some newby questions.
I want to change my single tone controle in the bone ray stack.
Do I put the volume afther te tone stack or leave it like the tweed infront of the stack ?
Will a12...

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Updates: Sat, Aug 30th, 2014 @ 10:02:09
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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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