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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
"HRD xfmr set"
Posted By prefsnider on 11/30/2015
I have a nice set of these xfrs. I'm thinking about an October Stage build. Can I do the build using diodes vs the 5AR4 with this PT? PT is rated at 388v@200mA and I'll be using KT66's....

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"Ampeg 1976 vt40"
Posted By steve25 on 11/29/2015
I have this late vt40 model on the bench , the one with channel clipping diodes and boy is this power supply layout just a tad convoluted!
Leave it to Magnavox as it was the same with there TVs I hav...

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"Center tapped transformer question"
Posted By Martin Bergheim on 11/28/2015
I have a 190-0-190 PT, and a lot of bridge rectifiers lying around. I've also got a few 1N4007's, but I want to use a bridge rectifier because it doesn't take up valuable turret board space. I've read...

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"New (to me) Heathkit IP-32"
Posted By Stack on 11/28/2015
I just got my new prototyping power supply in the mail today. [link]

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"SEL heaters/noise"
Posted By billpol66 on 11/28/2015

I was wondering if the heaters are elevated on the SEL , I read that all amps using a cathode follower were but I can't see it on the schematic , Thanks ....

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Updates: Mon, Nov 30th, 2015 @ 05:43:45
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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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