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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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Any other simple fixes to quirky machines out there?

ADA MicroTube power amps – worth it?

The solution is to buy a 75 cent neon light, pay the 5 dollar shipping fee, and solder it in. Join the HC Newsletter. I have a Microtube So far, I’d say they are very reliable given my experience to date. ADA MicroTube power amps – worth it? 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.

It was getting kind of miccrotube trying to hit just the right spot where the photo sensor is located with a flashlight. September 30, 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.


Elantric’s Tips and Blog: I’ve had a Microtube for about two years. Login or Sign Up. 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 microutbe. Thanks for posting that link.

January 06, That’s the only total failure I’ve had in the 7 years I’ve owned the 200. I like microtuve I can carry everything I need on a 4 space rack. Both were a good solution to lugging around a heavy tube amp, and i prefered closed back speakers.

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

Advertise on the most comprehensive and widely viewed musicians’ website. Please login or register. That’s incredibly useful and the ability to run it true stereo or bridged mono is nice. As far as reliabilty goes, mine only totally crapped out once, but with the help of the folks at www. Any problem can be solved by the suitable application of nuclear weapons.

Over time, that neon light gets dimmer. Help FAQs Go to top. This topic This board Entire forum Google. Finally got around to changing the neon lamp and the microtuube amp Powers Up Normally.


User Reviews for ADA Micro-Tube Power Amp at Harmony Central

I love having a presence control on the power amp. They did a good job with the hybrid tube setup, I suspect they may have lifted this from part of their ampulator circuit: It has never required repair and does not suffer ad long power up times. The 1U space is just great: I tried it and to my surprise, it works.

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

That’s a great resource site for us ADA owners. 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.

Anyone own one of these? However, I’ve also heard that they have some reliability issues. However, my understanding is that it does not affect normal operation and microtkbe can be corrected by replacing older caps in the “protect” circuit, if necessary. A web search offered up with the solution to my particular issue.