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Welcome

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
"Ocilliscope Safety Video"
Posted By FredB on 05/16/2012
More then once over the years I have read posts of people using scope probes like a battery operated multimeter, where they connect the ground clip of the scope probe to a point in an amp that is abov...

Discuss this entry
"Half a push-pull OT for single ended amp?"
Posted By erer44 on 05/16/2012
Hi,
I have push-pull output transformers out the wazoo from old organs and test equipment. Would one work on a P1x or Champ if I only wire up half of the primary?

Thanks!...

Discuss this entry
"Clean preamp sparkle/grit stage"
Posted By bagghist on 05/16/2012
This is about tube V6A (the amplifying half of the 12AU7, right before the CF). As I'm contemplating building this, the cathode resistor's value (90K) seems way too high. Is this because it's in paral...

Discuss this entry
"Blackface Clone Without Vibrato"
Posted By bpursley on 05/16/2012
Hi,
I'd like to get a wiring diagram of a blackface style amp with reverb, one channel only, without vibrato. Any ideas of how to best go about getting this?

Thank you...

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"Interesting noise issue"
Posted By bancika on 05/16/2012
I've never considered my mark IIc+ build to be very noisy, considering the amounts of gain but an interesting thing happened when I tried to slightly push it with an overdrive pedal. The noise level a...

Discuss this entry
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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!

2009-04-32:
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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