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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
"transformer weight"
Posted By Denny Allen on 09/26/2016
I am going to ask a lot of questions before this forum goes away. I have a rule of thumb to figure the wattage rating of unknown 60hz transformers. I weigh them and figure they are good for 20 watts...

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"power transformers"
Posted By Denny Allen on 09/26/2016

I have a question about power transformers. All transformers anymore seem to have a V/A rating. Does V/A equal watts only when driving a non-reactive resistive load?

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"tone control"
Posted By Denny Allen on 09/26/2016
Has anyone tried Frank Philipse’s tone control circuit? If so what did you think of it? [link] ...

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"Power transformer for Europe."
Posted By nostromoripley2000 on 09/25/2016

Compairing characteristics between the original transformer EDB269EX:


And the EDB369EX (i supposse it can work at 220V in the primary):...

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"HiWatt Preamp"
Posted By Jeph88 on 09/24/2016
Hello All

So I built the HiWatt style pre into this new build. I only built the NORMAL side of the first stage. Then it goes into the tone stack.

I find it just a hair too bright. Looking at th...

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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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