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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As far as midrotube goes, mine only totally crapped out once, but with the help of the folks at www. Appariently the brighness of neon protect light is somehow tied to under current microrube and that under current keeps the machine in protect mode. The solution is to buy a 75 cent neon light, microhube the 5 dollar shipping fee, and solder it in. September 30, I tried it and to my surprise, it works. They did a good job with the hybrid tube setup, I suspect they may have lifted this from part of their ampulator circuit: Over time, that neon light gets dimmer.
This topic This board Entire forum Google. Any problem can be solved by the suitable application of nuclear weapons.
Finally got around to changing the neon lamp and the power amp Powers Up Normally. 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 2000 mode. Join the HC Newsletter. 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 aea power up sometimes.
ADA MicroTube power amps – worth it? | Harmony Central
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. Any other simple fixes to quirky machines out there? That’s the only total failure I’ve had in the 7 years I’ve owned the thing. 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.
Both were a good solution to lugging around a heavy tube amp, and i prefered closed back speakers. However, I’ve also heard that they have some reliability issues. I have a Microtube View the Media Kit. I love having a presence control on the power amp. So far, I’d say they are very reliable given my experience to date.
The 1U space is just great: That’s a great resource site for us ADA owners.
ADA MicroTube power amps – worth it? Its a great sounding power amp, and well worth the money IMO.
ADA MicroTube power amps – worth it?
Overall, I’m really glad I picked one up in the end. Help FAQs Go to top. It has never required repair and does not suffer from long power microtuve times. 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.
Shine a bright light into the front vents behind the neon protect light when powering on. 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.
Anyone own one of these?