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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
Posted By mairj40 on 05/31/2016
I am having a hard time finding the transformers for the P1-X project. I have only found one supplier online. I have found a 125CSE transformer. Can that be used instead of the 125ESE transformer? Are...

Discuss this entry
"Parallel 6V6 - 6SL7 help"
Posted By ejb222 on 05/30/2016
Hello Gents,
I've built a parallel 6V6 amp with a 6sl7 preamp tube. I'm really delighted in how it is coming out; low noise, loud, and no smoke ;P
But I have a question for you. I can't really get ...

Discuss this entry
"Screen grid resistor"
Posted By Rafa89 on 05/30/2016
Im building an amp with a 6L6 running single ended. Ive seen many circuits for the screen grid.
The most common is a 1k or similar resistor connected on one end to the screen grid and to the pl...

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"How to Hammond 369EX?"
Posted By Julian Reck on 05/30/2016
Hi all,

I've been building a Hi-octane amp and everything has been great so far. But here's the thing. I'm using a Hammond 369ex instead of the 269ex which is used in the original schematic. I've b...

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"hickok 632c"
Posted By captlumpy on 05/28/2016
Evenin...Hickok 632c,$200.00 yes-no?..said it needs a filament resting bulb can't find anything on line about this unit,and tubes need to be tested,not sure if it will do a 300B......

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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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