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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
"heyboer transformer substitutes?"
Posted By stinni on 11/27/2014
Hello there people of ax84 land. I'm looking into building the ax84 october-stage version but the heyboer transformers seem to be hard to get, or at least I can't find them online. has anyone any expe...

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"Output transformers"
Posted By Audiosalvage on 11/26/2014
I've got two push pull OTs for sale for the price of $30. I know one powered a pair of 6v6s and the other 7868s. I would also consider a trade for a Single end OT. Thanks, Mark...

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"(Old-ish) 5F1-clone puzzle"
Posted By DutchMarco on 11/26/2014
It has been a long time now since I've used my existing amps, never mind about building new ones. So I wanted to get my Vamp (5F1 clone) back up and running, I have used that amp so much in the past, ...

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"The secret to a hum-free stand-alone preamp is..."
Posted By Darren Porter on 11/25/2014
.... what???

I've built two now and I'm totally frustrated because they both hum like crazy. I've done other complete builds (one with a layout of my own making) that are hum-free so I _think_ I ha...

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"negative feedback"
Posted By Dan Moos on 11/25/2014
I've never done an amp with negative feedback before, but am now craving the touch sensitivity and guitar control of distortion it enables.

I've been looking at these schematics: [link]

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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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