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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
"AX84 sel amp"
Posted By Don Riffle on 09/02/2015
Novice here. I decided to do the sel amp mainly as a challenge because it stated that a novice should start with a easier one. I bragged to Chris how easy it was, this being before I had tried hooking...

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"SEL Print issue(s)"
Posted By billpol66 on 09/01/2015

Went down to Staples to print out templates , the turret board came out fine but the chassis template was not large enough. If the chassis top is 8" and both panels are 2" how does that print on ...

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"Examples of Cathode-biased EL34 amps?"
Posted By Darren Porter on 09/01/2015
Anyone have any ideas about what schematics I could look at for a cathode-biased EL34 amp? I was reading some old threads on another forum about how nice a cathode-biased EL34 PP amp sounds @ 350Vp an...

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"Revision 10.10.04 Schematic"
Posted By Rick Short on 09/01/2015
I have the revision 10.10.04 schematic and am working through the math as presented in "Introduction to Tube Amplifier Theory: 10.02.15 Featuring the AX84 P1-eXtreme Amplifier" by Sorlien, revised and...

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"Ceiling Fan Tremolo"
Posted By Dire Wolf on 09/01/2015
With the ceiling fan running I get a tremolo effect when I play my amp. The higher the pitch the more pronounced the effect. This has happened at different locations. I am trying to figure out the bes...

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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.

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