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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ADA MicroTube power amps – worth it? I love having a presence control on the power amp.

Over time, that neon light gets dimmer. The 1U space is just great: That’s the only total failure I’ve had in the 7 years I’ve owned the thing.

ADA MicroTube power amps – worth it? | Harmony Central

However, my understanding is that it does not affect normal operation and it can be corrected by replacing older caps in the “protect” circuit, if necessary. Anyone own one of these? The other issue it does have is that it goes into a “protect” mode and it takes a long time about a minute or two for it to power up sometimes. Elantric’s Tips and Blog: Help FAQs Go to daa. It was getting kind of old trying to hit just the right spot where the photo sensor is located miccrotube a flashlight.


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That’s incredibly useful and the ability to run it true stereo or bridged mono is nice. Overall, I’m really glad I picked one up in the end. Advertise on the most comprehensive and widely viewed musicians’ website.

September 30, Appariently the brighness of neon protect light is somehow tied to under current detection and that under current keeps the machine micgotube protect mode.

They did a good job with the hybrid tube setup, I suspect they may have lifted this from part of their ampulator circuit: Login or Sign Up. I like that I can carry everything I need on a 4 space rack. 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.

I’ve been very happy with it. A web search offered up with the solution to my particular issue. Finally got around to changing the neon lamp and the power amp Powers Up Normally.

Thanks for posting that link. However, I’ve also heard that they have some reliability issues.

Miccrotube a great resource site for us ADA owners. January 06, It has never required repair and does not suffer from long power up times.


Occasionally I have to toggle the power switch to get it to fire up, but other than that it works great. I have a Microtube As far as reliabilty goes, mine only totally crapped out once, but with the help of wda folks at www. The solution is to buy a 75 cent neon light, pay the 5 dollar shipping microtubd, and solder it in.

Any other simple fixes 020 quirky machines out there? Any problem can be solved by the suitable application of nuclear weapons. 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 there, I’m tempted to try one.

ADA MicroTube power amps – worth it?

I’ve had a Microtube for about two years. Please login or register. I own an old ADA microtube power amp that has seen years of good service, but now it will not power up and stays in protect mode. I tried it and to my surprise, it works. Join the HC Newsletter. Both were a good solution to lugging around a heavy tube amp, and i prefered closed back speakers.

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