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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It has never required repair and does not suffer from long power up times. A web search offered up with the solution to my particular issue.

Join ava HC Newsletter. Elantric’s Tips and Blog: As far as reliabilty goes, mine only totally crapped out once, but with the help of the folks at www.

ADA microtube power amp – Weird Gear Problems and Solutions

Login or Sign Up. January 06, Finally got around to changing the neon lamp and the power amp Powers Up Normally. That’s the only total failure I’ve had in the 7 years I’ve owned the thing. Any other simple fixes to quirky machines out there?

Occasionally I have to toggle the power switch to get it to fire up, but other than that it works great. This topic This board Entire forum Google. Overall, I’m really glad I picked one up in the end. So far, I’d say they are very reliable given my experience to date. I love having a presence control on the power amp. ADA MicroTube power amps – worth it? Thanks for posting that link.


However, I’ve also heard that they have nicrotube reliability issues. September 30, I like that I can carry everything I need on a 4 mocrotube rack.

Anyone own one of these? I’ve been very happy mlcrotube it. I have a Microtube Any problem can be solved by the suitable application of nuclear weapons.

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.

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. View the Media Kit. The solution is to buy a 75 cent neon light, pay the 5 dollar shipping fee, and solder it in.

They did a good job with the hybrid tube setup, I suspect they may have lifted this from part of their ampulator circuit: Ad own an old ADA microtube power amp that has seen years of good service, but now it will microtjbe power up and stays in protect mode. 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.


The 1U space is just great: It was getting kind of old trying to hit just the right spot where the photo sensor is located with a flashlight. Shine a bright light into the front vents behind the neon protect light when powering on. That’s incredibly useful and the ability to run it true stereo or bridged mono is nice.

Please login or register. Its a great sounding power amp, and well worth the money IMO. Help FAQs Go to top. Appariently the brighness of neon protect light is somehow tied to under current detection and that aa current keeps the machine in protect mode.

That’s a great resource site for us ADA owners. I tried it and to my surprise, it works. I’ve read mocrotube they really just use a couple of 12AX7 tubes to “warm up” a solid mlcrotube tube section, but being that there aren’t many affordable 1U tube power amps out there, I’m tempted to try one.

I’ve had a Microtube for about two years.

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. Both were a good solution to lugging around a heavy tube amp, and i prefered closed back speakers. Over time, that neon light gets dimmer.

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