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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
"Firefly PCB Layout"
Posted By DarkV on 08/03/2015
Hello all! I just signed up here but I've been browsing for a little while now. This is going to be my 2nd tube amp build as my first 5E3 deluxe was far too loud for my apartment. Go figure, I thought...

Discuss this entry
"SEL turret board"
Posted By billpol66 on 08/03/2015
Hi folks, I was wondering if anyone has turret boards premodern for an SEL project I am to start soon, since I do not have a drill press thought it might be the best option.......,Thank you....

Discuss this entry
"Designing an attenuator"
Posted By CChurchill on 08/02/2015
I would like to build an attenuator. With out having much experience with owning or using them, I would like some opinions the different circuits and different preferences. I drew up a -19dB Pi attenu...

Discuss this entry
"DIN Rail Power Supplies for Switching Supply"
Posted By mkennes on 08/01/2015
Hello, I'm wondering if anyone can see any problems with mounting this unit into a chassis of a amp to provide the 12V supply for relay switching?


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"Help with theory / maths - preamp bias"
Posted By tristanc on 08/01/2015
Hi all,

An appeal for help with the theory / maths side of things...

I've spent the last couple of months reading (and re-reading) Merlin's and RK's books, along with the P1-eX theory document a...

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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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