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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
"6l6 gone wrong"
Posted By Anthony B on 07/24/2016
Anyone seen this happen? If its idleing it behaves normally, if you start smashing out power chords at full volume for a few min, it starts drawing 150ma current and the whole bulb is glowing blue. ...

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"reduce voltage jcm 800"
Posted By Audiosalvage on 07/23/2016
Hi, I have a marshall 50 watt clone which currently employs a bridge rectifier with a voltage doubler to get about 500v at the plates. I was wondering if I could just set it up with a full wave using...

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"Sears amp conversion project"
Posted By scottyB on 07/23/2016
Hi everyone, new member here with a project I hope may be interesting to others.

I'm working on an amp from an old Sears tape unit: 6X5 rectifier, 12AU7 preamp, 12AX7 "audio frequency amp," 6V6 out...

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"Bipolar power supplies for tube designs"
Posted By Hank Cohen on 07/19/2016
As a result of buying the wrong transformer for my guitar amp design I now have an extra center tapped power transformer that delivers +-358V AC. Since I don't have any desire to build a 100W amp I h...

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"Building a Clean Pre -> 20W PP Power"
Posted By drchek on 07/18/2016
I'm building my first tube amp (after many pedal builds) and I've decided to use the Clean Preamp coupled with the 20W PP Poweramp. I want a nice clean tube platform for my pedals.

Any gotchas or 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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