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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
"Anode and cathode resistor effect on frequency response"
Posted By foulowl on 04/18/2014
Hi folks,

Looking for a good rough rule of thumb with regard to how anode and cathode resistors affect frequency response, if they do at all. (for example, increasing X will boost high end, etc.)

Discuss this entry
"pentode or triode/3K or 5k for EL34"
Posted By kayakman on 04/17/2014
I am unsure if this amp is operating an el34 in pentode or triode

I have an additional question regarding best primary impedance for EL34 3K or 5K ...

Discuss this entry
"ECC88 / E88CC linearity"
Posted By DanGu on 04/17/2014
Hi! An old friend of mine asked me to build him an hifi SE amp using 300B tubes. So designing it I thinked to drive that big triode with an SRPP stage. My choice dropped to the E88CC looking at those ...

Discuss this entry
"October Impedance Selector"
Posted By John Bgron on 04/16/2014
Hi guys,

I got my October Club working yesterday and played it all night. It's a great amp, thanks so much for the project.

I'm confused about the impedance selector, I'm using a Hammond 125E a...

Discuss this entry
"New guy"
Posted By MrMDK on 04/16/2014
New guy here.

I broke my left wrist in two places about 5 years ago. I tried every way I knew how to play guitar again and failed. Until last week. Sitting on my neighbors couch I was able to play...

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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!

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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