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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
"Getting Lost on the Fundamentals Here"
Posted By neptoess on 10/03/2015
Hi guys,
This is my first post here, but I've been lurking for a while. I've learned quite a bit from these forums. Anyway, I'm pretty much lost on an issue I'm having with my 1989 Laney AOR 50 Serie...

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"Bogen CHB-100 to 2 channel Fender/Marshall guitar amp"
Posted By Ron Fast on 10/01/2015
I have a 100w Bogen CHB-100 with quad 7868 power tubes, 6EU7, 2-12AX7's, and a 6C4. My thought is to make 2 amps in one using the PT, OT, tubes and/or tube sockets that are already there. What I am th...

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"New hardware"
Posted By Chris Hurley on 09/30/2015
We moved the server to new hardware today. I've tested as much as I can think of and things appear to work but anything one of these moves happens, things break.

Send me an email if you notice any...

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Posted By Chris Hurley on 09/30/2015
new hardware test...

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"AB763 Tremolo Circuit Question"
Posted By robrob on 09/28/2015
What is the purpose of the full negative bias voltage connection to the grid side of the tremolo oscillator in the AB763?

AB763 Sechematic:

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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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