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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Both were a good solution to lugging around a heavy tube amp, and i prefered closed back speakers.

The solution is to buy a 75 cent neon light, pay the 5 dollar shipping fee, and solder it in. 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. Please login or register.

They did a good job with the hybrid tube setup, I suspect they may have lifted this from part of their ampulator circuit: Shine a bright light into the front vents behind the neon protect light when powering on. 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.

September 30, 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. A web microtubw offered up with the solution to my particular issue.


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 mcirotube idea that they had reliability issues.

I’ve had a Microtube for about two years. As far as reliabilty goes, mine only totally crapped out once, but with the help of the folks at www. It was getting kind of old trying to hit just the right spot where the photo asa is microtubee with a flashlight. 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.

Help FAQs Go to top. Occasionally I have to toggle the power switch to get it to fire up, but other than that it works 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?

However, I’ve also heard that they have some reliability issues. The 1U space is just great: I like that I can carry everything I need on a 4 space rack.

Thanks for micrktube that link. Join the HC Newsletter. This topic This board Entire forum Google. Over time, that neon light gets dimmer. Login or Sign Up. I had heard about this and considered this as a potential issue when I bought it, but being an ADA fan, and having a certain amount of faith in their stuff and the support ADA depot helped me not worry too much about pulling the trigger on it. Any problem can be solved by the suitable application of nuclear weapons.


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

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 microtuge mode. Finally got around to changing the neon lamp and the power amp Powers Up Normally.

That’s a great resource site for us ADA owners. 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. Elantric’s Tips and Blog: Anyone own one of these? View the Media Kit. Overall, I’m really glad I picked one up in the end. I’ve been very happy with it.

I have a Microtube Advertise on the most comprehensive and widely viewed musicians’ website. ADA MicroTube power amps – worth it? So far, I’d say they are very reliable given my experience to date. Any other simple fixes to quirky machines out there?