Account Info
Greetings, Guest.

Reset Password
Create New Account

Browser cookies are required for these functions.

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
"Turret Wiring"
Posted By lkrasner on 04/26/2015
How do you guys recommend wiring to turrets? I generally try to stick the leads of components in the top, then wrap any wires around the base. However, this falls apart when there are multiple thick-l...

Discuss this entry
"Under $50 Over-Ear Headphones"
Posted By Douche Baggins on 04/26/2015
Just purchased a Status Audio HD One headphone [link] last week. I researched a lot of under $50 headphones before deciding on this one. There are several reviews on line, almost a...

Discuss this entry
"Poweramp Cathode Bypass W/ Bias Check Resistor"
Posted By lkrasner on 04/25/2015
When putting a 1 ohm resistor in series with the bias resistor to facilitate checking of the bias current, should the bypass cap fully bridge BOTH resistors, or is it ok to leave it only across the la...

Discuss this entry
"Using an old SE transformer"
Posted By DaveW on 04/24/2015
I have been given an old partridge transformer. As far as I can tell it is a single ended unit and looks to be quite high power. It has one secondary which has a resistance of 44.8 ohm, the primary ha...

Discuss this entry
"output section"
Posted By jmpj46 on 04/23/2015
I am building the lead 2 amp brian schmittling version on the output jack the yellow wire goes to the +and- the - goes through the 220r 5watt resistor and the middle lug with the black arrow goes to +...

Discuss this entry
Like us and Find us

Subscribe to me on YouTube

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...
* 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.

AX84® is a registered trademark of Doberman Music Products, LLC. AX84.COM content may not be reproduced without the express written consent of Doberman Music Products, LLC (
For information about using the AX84® trademark, project names and designs, click here