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’ve had a Microtube for about two years. I have a Microtube I’ve been very happy with it. Help FAQs Go to top. That’s the only total failure I’ve had in the 7 years I’ve owned the thing.

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So far, I’d say they are very reliable given my experience to date. The other issue it does have is that it goes into a “protect” mode and it aa a long time about a minute or two for it to power up sometimes.

Any problem can be solved by the suitable application of nuclear weapons. Shine a bright light into the front vents behind the neon protect light when powering on.


ADA MicroTube power amps – worth it? | Harmony Central

View the Media Kit. Finally got around to changing the neon lamp and the power amp Microtubs Up Normally. Thanks for posting that link. Please login or register.

Over time, that neon light gets dimmer. Advertise on the most comprehensive and widely viewed musicians’ website. That’s a great resource site for us ADA owners.

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

ADA MicroTube power amps – worth it?

Elantric’s Tips and Blog: I’ve read that they really just use a couple of 12AX7 tubes to “warm up” ara solid state tube section, miccrotube being that there aren’t many affordable 1U tube power amps out there, I’m tempted to try one. The 1U space is just great: They did a good job with the hybrid tube setup, I suspect they may have lifted this from part of their ampulator circuit: However, I’ve also heard that they have some reliability issues.

Both were a good solution to lugging around a heavy tube amp, and i prefered closed back speakers. A web search offered up with the solution to my particular issue.

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I love having a presence control on the power amp. The solution is to buy a 75 cent neon light, pay the 5 dollar shipping fee, and solder it in. January 06, That’s incredibly useful and the ability to run it true microtuve or bridged mono is nice. Occasionally I have to toggle the power microube to get it to fire up, but other than that it works great. September 30, As far as reliabilty goes, mine only totally crapped out once, but with the help of the folks at www.

Overall, I’m really glad I picked one up in the end.

It was getting kind of old trying to hit just the right spot where the photo sensor is located with a mircotube. Anyone own one of these? Join the HC Newsletter.

Appariently the brighness of neon protect light is somehow tied to under current detection and that under current keeps the machine in protect mode. I like that I can carry everything I need on a 4 space rack. ADA MicroTube power amps – worth it?