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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
"Traynor YCV40/50 power tube setup"
Posted By Andyman on 04/16/2014
I compared the scheamtic of the traynor YCV-40 and its british cousin the YCV-50B.
One uses beam tubes (6L6GC) and the other uses the pentodes (EL34). But they have the same power supply.. 410V plat...

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"Trace Elliot Amp Repair"
Posted By boblove on 04/15/2014
This is the only area that I think this belongs. If this is out of bounds as far as forum rules go, let me know as well.

So here goes.

I have an old (older) Trace Elliot GP7SM 300 Bass amp he...

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"October Club blown transformer?"
Posted By John Bgron on 04/15/2014
Hi guys,

I finally got around to finishing my October Club amplifier. It worked (almost) fine when I first powered it up but V2 started red plating. I powered down, removed the power tubes and st...

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"Output problems"
Posted By winghamwill on 04/13/2014
Hi, i have finnished building my first amp, an SEL and it sounds awesome!! So loud, no buzz, its just great, although, when recording last week i had a problem where it suddenly cut out, as we were st...

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"Mark L's fx loop"
Posted By sajyho on 04/13/2014
Hi guys, sorry to bother you again, I'm trying to add a fx loop to my HO. I've tries some of 12au7 designs but none worked well.
I've read on this forum that Mark L has a nice design using 12ax7, bu...

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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.

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