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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
"Newbie question: P1 in Marshall Lead 12?"
Posted By wbajzek on 02/22/2017
Hello! I have built some pedals and modded my Gibson Skylark Crestline, and now I'm looking to build by first tube amp soon. I've got a Marshall Lead 12 which is kind of terrible, and I was thinking o...

Discuss this entry
"Is there a formula for....."
Posted By John Berthiaume on 02/17/2017
Not sure exactly how to ask this so here goes...

How to determine voltage rating on a PT?
I have an old one that measures 305 to CT each leg (I just got from Ebay.

I assume the is a drop when u...

Discuss this entry
"DaisyCutter 12AX7 Cathode Resistors"
Posted By mjones32 on 02/16/2017
I built a DaisyCutter push-pull a couple of years ago,sticking pretty much to the AX84 schematic. Nice amp but I still feel the voice can be improved....I feel it is a bit buzzy when the gain is crank...

Discuss this entry
"crossover ideas for multi-speaker cab"
Posted By John McGrath on 02/16/2017
Thinking out loud here......I have some Italian Jensen speakers kicking around the shop and thinking of putting them in a single cab. The idea is to use a 15" and two 10". The use case is guitar, bu...

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"1965 National Glenwood Model 90"
Posted By JeffW on 02/15/2017
I thought I would throw out the net and see if anyone has a schematic for this amp.

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Updates: Thu, Feb 23rd, 2017 @ 16:55:03
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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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