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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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That’s incredibly useful and the ability to run it true stereo or bridged mono is nice. Appariently the brighness of neon protect light is somehow tied to under current detection and that under current keeps the machine in protect mode. A web search qda up with the solution to my particular issue. I tried it and to my surprise, it works.

ADA MicroTube power amps – worth it? | Harmony Central

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 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. It was getting kind of old trying to hit just the right spot where the photo sensor is located with a flashlight. 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 imcrotube too much about pulling the trigger on it.


ADA microtube power amp – Weird Gear Problems and Solutions

Login or Sign Up. That’s a great resource site for us ADA owners. However, I’ve also heard that they have some reliability issues.

Anyone own one of these?

ADA MicroTube power amps – worth it?

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. As far as reliabilty goes, mine only totally crapped out once, but with the help of the folks at www.

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That’s the only total failure I’ve had in the 7 years I’ve owned the thing. Please microtybe or register. I’ve been very happy with it.

The 1U space is just great: Both were a good solution to lugging around a heavy tube amp, and i prefered closed back speakers. Its a great sounding power amp, and well worth the money IMO.

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.

ADA MicroTube power amps – worth it? So far, I’d say they are very reliable given my experience to date. This topic This board Entire forum Google. 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.


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 love having a presence control on the power amp. Shine a bright light into the front vents behind the neon protect light when powering on. Elantric’s Tips and Blog: Over time, that neon light gets dimmer. I’ve had a Microtube for about two years. Overall, I’m really glad I picked one up in the end.

Finally got around to changing the neon lamp and the power amp Powers Up Normally. The solution is to buy a 75 cent neon light, pay the 5 dollar shipping fee, and solder it in. Thanks for posting that link. Any problem can be solved by the suitable application of nuclear weapons. I own an old ADA microtube power amp that has seen years of micdotube service, but now it will not power up and stays in protect mode. Any other simple fixes to quirky machines out there?

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