Audio Aero Prima integrated Mk1. Just bought it

Well, you guys made it. I spent the whole morning researching tubes online and didn't get any work done. Anyway, this is for the good.

I asked the seller of my MkI and it has a Tesla tube. I did a little searched and it seems they are really similar to the Siemmens.
See here:

http://www.mht.bme.hu/~ehmann/Tesla%20vs.Siemens/tesla_vs.siemens.htm

Nevertheless, I am rather suspicious. Tesla tubes are slightly cheaper than Siemmens (See the following listing: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=67816&item=5754089979&rd=1)

Regardless, I love the man (Tesla), probably the greatest investor of all times. So, I will give them a shot. Needless to say that I will compare them against the Siemmens and the Mullard.

Once again, thanks for everything. Josep

In my other amp, the Tesla had a slightly thinner, more analytical sound than the Siemens. Have not tried it in the Prima Hybrid, however. Try different tubes. The amp takes only one 6922 tube, so you don't have to buy them in pairs. You'll find one that suits you.

Hi everyone, while I am waiting for my MKI to arrive I emailed the Audio Aero guys because I was wondering whether this is a class-A amp or not. Well, they finally replied (to my surprise) saying this is a class-B. (Not even a class AB.) Well, I know there is more to life than class-A and other technical specifications, but can anyone provide some thoughts on this matter? Thanks, Josep

I just purchased this MK I version and it is very good. The used market makes these a steal. I have not heard everything but it is the best that I have heard. It bests
equipment that goes for twice or more of the new price. I was worried about it being only 40 watts but it has more power than I need and I listen to a lot of rock. It will also kick out enough base for rock music, something that some integrateds won't do.
Thank you Boa2.

I just received the MK1. I must say I am really impressed with its performance. The sound is warm and honestly I don't know why you need more than 40W. It makes my Triangles fly! The only thing that surprised me is that it did not have phono stage, but that's fine. I don't even own a turntable. Right now it has the Tesla tube in it and I bought a couple of Mullards and the Siemmens to compare, but I think I'll wait, since it seems that it is pretty tough to open. (It's got many screws...)
In addition, I have to tell you that Audio Aero contacted me again correcting their last email. The amp is AB, apparently it uses the TDA7294 DMOS amp. I guess that just gives me piece of mind. Thank you all for your great advice. Josep