April 23, 2020   |   by admin

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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The issue Tomcat refers to is a fairly microutbe 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.

Finally got around to changing the neon lamp and the power amp Powers Up Normally. Help FAQs Go to top. As far as reliabilty goes, micrrotube only totally crapped out once, but with the help of the folks at www.

This topic This board Entire forum Google. Over time, that neon light gets dimmer.

ADA MicroTube power amps – worth it?

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. I have a Microtube Shine a bright light into the front vents behind the mirotube 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 imcrotube amps out there, I’m tempted to try one. I’ve been very happy with it. 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 mode. 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.

I tried it and to my surprise, it works.

However, I’ve also heard that they have some reliability aca. Advertise on the most comprehensive and widely viewed musicians’ website. They did a good job with the hybrid tube setup, I suspect they may have lifted this from part of their ampulator circuit: Thanks for posting that link. September 30, Please login or register.

I like that I can carry everything I need on a 4 space rack. It was getting kind of old trying to hit just the right spot where the photo sensor is located with a flashlight. Any problem can be solved by the suitable application of nuclear weapons. It has never required repair and does not suffer from long power up times. Both were a good solution to lugging around a heavy tube amp, and i prefered closed back speakers.

I love having a presence control on the power amp. However, my understanding is that it does not affect normal operation and microgube can be corrected by replacing older caps in the “protect” circuit, if necessary. Anyone own one of these?


Login or Sign Up. So far, I’d say they are very reliable given my experience to date. Appariently the brighness of neon protect light is somehow tied microyube under current detection and that under current keeps the machine in protect mode.

ADA MicroTube power amps – worth it? | Harmony Central

The solution is to buy a 75 cent neon light, pay the 5 dollar shipping fee, and solder it in. A web search offered up with the solution to my particular issue. Overall, I’m really glad I picked one up in the end. Any other simple fixes to quirky machines out there? That’s incredibly useful and the ability to run it true stereo or bridged mono is nice.

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The 1U space is just great: View the Media Kit. I’ve had a Microtube for about two years. Join the HC Newsletter. 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 micotube in their stuff and the support ADA depot helped me not worry too much about pulling the trigger on it.

ADA MicroTube power amps – worth it?