This is a Made in USA ADA Microtube amplifier in perfect working order. It is an excellent amp for guitar or bass amp rigs. It has a 12AX7. I’m not going to buy another one. I’m not gigging so I’m not in a rush to run out and buy. Maybe I’ll save up my mo Anonymous Reviewer’s review of ADA. Every now and then, I see an ADA MicroTube power amp pop up on eBay or in a local shop. I’ve had a Microtube for about two years.

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I like that I can carry everything I need on a 4 space rack. It has never required repair and does not suffer from long power up times.

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The 1U space is just great: January 06, This topic This board Entire forum Google. I have a Microtube The solution is to buy a 75 cent neon light, pay the 5 dollar shipping fee, and solder it in. Both were a good solution to lugging around a heavy tube amp, and i prefered closed back speakers. Advertise on the most comprehensive and widely viewed musicians’ website.

Join the HC Newsletter. That’s a great resource site for us ADA owners.

I love having a presence control on the power amp. View the Media Kit.


Overall, I’m really glad I picked one up in the end. Elantric’s Tips and Blog: However, I’ve also heard that they have some reliability issues. Appariently the brighness of neon protect light is somehow tied to under current detection and that under current keeps the machine in protect mode.

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Its a great sounding power amp, and well worth the money IMO. Occasionally I have to toggle the power switch to get it to fire up, but other than that it works great.

Please login or register. Login or Sign Up. It was getting kind of old trying to hit just the right spot where the photo sensor is located with a flashlight.

I own an old ADA microtube power amp that has seen years of good service, but daa it will not power up and stays in protect mode.

The other issue it does have microtubs that it goes into a “protect” mode and it takes a long time about a minute or two for it to power up sometimes. Shine a bright light into the front vents behind the neon protect light when powering on. Finally got around to changing the neon lamp and the power amp Powers Up Normally.

ADA MicroTube power amps – worth it? | Harmony Central

That’s the only total failure I’ve had in the 7 years I’ve owned the thing. I’ve read that they really just use a couple of 12AX7 tubes to “warm up” a solid state tube section, but being that there aren’t many affordable 1U tube power amps out kicrotube, I’m tempted to try one. The issue Tomcat refers to is a fairly common one where the power amp will take a while to start, and may be where you picked up the idea that they had reliability issues.


September 30, However, my understanding is that it does not affect normal operation and it can be corrected aca replacing older caps in the “protect” circuit, if necessary. I tried it and to my surprise, it works.

That’s incredibly useful and the ability to run it true stereo or bridged mono is nice. I’ve been very happy with it. Thanks for posting that link. ADA MicroTube power amps – worth it? They did a good job with the hybrid tube setup, I suspect they may have lifted this from part of their ampulator circuit: Over time, that neon light gets 020.

Any problem can be solved by the suitable application of nuclear weapons.