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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
"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...

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"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...

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"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 +...

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"Hookup Wire Choices"
Posted By KenInVic on 04/23/2015
I'm looking at some different lines of wire from Mouser to use for hookup inside the P1 I am building. Two are 18AWG and are Alpha series 1857 and 3075. The other two are 22AWG and are Alpha series ...

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"Ca Dreamer Fuse Blowing"
Posted By Jon Endres on 04/23/2015
Built a CA Dreamer a couple of years ago, very close to Dave Zeryck's 2.6 version whose schematic is available here.

Worked and sounded great for 2+ years, but then started blowing the 250mA fuse o...

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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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