AX84 is staying put right here for the foreseeable future. Game on!

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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
"VVR installation"
Posted By muhammad hossain on 10/02/2019

I found this layout diagram for VVR. Can someone shed some light on this? will it be a good VVR circuit for the 4 4 0 amp?


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"Lead II Club transformers"
Posted By Pool Ninja on 10/01/2019
Im about to begin a L2 Club build and am hoping to use the transformers from an old 18 watt clone. The schematic calls for a Hammond 270EX PT (275-0-275 @144mA, 6.3V @ 4A) and Hammond 1650FA OT (7.6k...

Discuss this entry
"If you were going to add a FX loop to this amp..."
Posted By Mike Knauf on 09/25/2019
This amp:


I'm by far an expert on loops. I don't really use them, and I don't have a slew of g...

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"Amp sounds buzzes when picked hard"
Posted By muhammad hossain on 09/23/2019

I finished building the amp. i doubt i have the OT (Hammond 125c) wired incorrectly. my speaker is a V30 @ 8ohms; so i wired tap no 2 and 4 off of the OT to the spkr. did I do it right?


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"Can any amp be converted to cathode bias?"
Posted By GuiteLectrique on 09/23/2019
Hi everyone,

I'm planning a build with a set of transformers salvaged from a Crate Vintage Club 60. The original VC-6212 circuit is 60 watt with a fixed biased EL34/6L6 pair. My plan is to build a ...

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AX84 is staying put right here for the foreseeable future!

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