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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
"18W build"
Posted By David Staepelaere on 05/18/2013
I finally got around to finishing an 18W build I started a while ago, so I thought I'd share some photos.

[link]

Discuss this entry
"Preventing heater hum"
Posted By Caprotesta on 05/18/2013
Hello all,

On all the prior builds I've done, the heater filaments were powered by the filament secondaries coming off the PT. I'm looking at a schematic:

[link]

Discuss this entry
"6 x EL34 / 4 x KT88"
Posted By DaveW on 05/18/2013
I am building a HIWATT type amp using a similar preamp to the HW 'Jimi Page' version. I have an Sound City 120 PA chassis which I am using as a donor for the chassis and iron. This used 6 x EL34 valve...

Discuss this entry
"test of 85 12AX7B from the far west"
Posted By steve25 on 05/17/2013
In the last few months one of the things I have been spending my time on is perfroming QC on a line of new condencer recording Mics along with their repair(yes even when new!) and part of the process ...

Discuss this entry
"Shield lead of power xformer"
Posted By Caprotesta on 05/16/2013
Hi all,

I've got a power transformer with three leads coming from the primary: 0v, 120v, and shield. I understand that the shield lead is supposed to be a ground connection, but where should it be ...

Discuss this entry
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Updates: Sat, May 18th, 2013 @ 17:51:38
Updates to pages about

'fxprojects'

have been completed.
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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