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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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 have a Microtube They did a good job with the microfube tube setup, I suspect they may have lifted this from part of their ampulator circuit: That’s incredibly useful and the ability to run it true stereo or bridged mono is nice.

January 06, September 30, Advertise on the most comprehensive and widely viewed musicians’ website. That’s a great resource site for us ADA owners.

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. 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.


Over time, that neon light gets dimmer.

A web search offered up with the solution to my particular issue. So far, I’d say they are very reliable given my experience to date. However, I’ve also heard that they have some reliability issues. 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.

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

ADA MicroTube power amps – worth it?

Overall, I’m really glad I picked one up in the end. 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 microtubd and the support ADA depot helped me not worry too much about pulling the trigger on it. Shine a bright light into the front vents behind the neon protect light when microtubee on.

Any problem can be solved by the suitable application of nuclear weapons. Login or Sign Up. It has never required repair and does not suffer from long power up times. Help FAQs Go to top. I own an old ADA microtube power amp that has seen years of good 020, but now it will not power up and stays in protect mode. I’ve had a Microtube for about two years. View the Media Kit. The 1U space is just great: Elantric’s Tips and Blog: Finally got around to changing the neon lamp and the power amp Powers Up Normally.


ADA MicroTube power amps – worth it? | Harmony Central

I love having a presence control on the power amp. Occasionally I have to toggle the power switch to get it to fire up, but other than that it works great.

ADA MicroTube power amps – worth it? It was getting kind of old trying to hit just the right spot where the photo sensor is located with a flashlight. Its a great sounding power amp, and well worth the money IMO.

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Anyone own one of these?