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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
"Low filament voltage under load"
Posted By pwats on 10/26/2016
Hey guys,

I've just wired up a 5e3 build and am noticing that my heater voltages are too low. The PT was salvaged from another project and unloaded the filament winding measures 7.5 or so, but load...

Discuss this entry
"Vox Hi Cut with a cathodyne inverter"
Posted By Jeph88 on 10/26/2016
Has any one used a Vox style high cut control with a Princeton Reverb type amp? If so did it work well with the cathodyne ie volume loss... tone issues ?

Thank you


Discuss this entry
"Choke input PS"
Posted By Denny Allen on 10/26/2016

I have asked about a choke input power supply in another unrelated post but now I have another question. Others have suggested putting a small capacitor at the choke/rectifier junction where a la...

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"Question on pre-effects loop attenuation"
Posted By tristanc on 10/25/2016
I’m looking to add Merlin’s serial effects loop (2nd ed, pg 219) to my SEL-style build, taking the signal from the treble wiper and returning it to the top of the MV.

When I simulate just the loop ...

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"Amp settings of the rich and famous"
Posted By tristanc on 10/24/2016
Frank Zappa's estate are selling all his stuff. Such a shame. Some interesting things available: [link]

I'm always interested to see what settings the...

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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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