What's about EDGE Audio ?

MMB, maybe you meant 34K Ohm? If so, it would probably be ok with most tube preamps but you may want to try a given combination before you make any commitment. If a power amp's input impedance is too low relative to the preamp's output impedance it can result in rolled off bass and limited dynamics.

The new Edge amps 12.2 series do not use the laser biasing technology of the 12.1 and earlier models. The new owners are not associated with Norbert and Maker (I think thats right) who started Edge and ran it out of Florida. The article I read which was a review of the new 10.2 went over the change briefly. Edge has indictaed they have experience no problems with the laser bias and when I spokw ro Edge about my Sig 1.1 SE preamp they indicated they could service any model. I have experienced no problems with my Edge products and think thsy sound fantastic. I am currently running my Edge amp with an Allnic L-3000 tube preamp (since last Sept) and think it sounds better than the Edge combo. I love what a good tube pre brings to the table. I do not know th production date of the various models but as long as it is in good shape I would not worry too much. I have had mine since 2006-constant use and no issues.

Just a quick follow up. The only issue I noticed at first was very limited ability to increase the volume particularly with CD. Very loud quickly with an impact on balance at low levels. I found this interesting since both the Edge and Allnic had about 20db of gain. I at first returned the Allnic because I felt this was a significant limiting factor. Decided to have the 14db gain transformer option change made and have been very happy since.

I have an Edge NL12.2 and think it is fabulous. Transparent, dynamic, toneful, powerfully- everything you can and should ask for in an amp in that price range. System matching is always important and the Edge amps like a fast, clean sounding speaker that can image and throw a soundstage. I've never had any issues with Edge amps. Both the new owners and past owners have been great to work with.
My current set up:
Esoteric k-01 and separate clock
Edge NL 12.2 amp
Edge NL 1.2 pre amp
Custom speakers using Accuton drivers
Virtual Dynamics cabling

I echo Sherpa's comments on my NL 12.1 that I've owned since 2007 with extreme levels of happiness and musical enjoyment. This amp performs at a level that is well above anything else I've heard. I had talked with the new Edge company leads last year about the 12.2 and 10.2 having the laser bias removed; they maintained they had improved the amps' performance by using what were in their opinion even better components for other aspects of the amp that no longer necessitated the use of laser biasing. I've talked to others that have heard both and they say the 12.2 and 10.2 are great amps but that the 12.1 and 10.1 still hold their own.

I'm not sure if the new Edge is still producing products but I've not seen anything to the contrary...

***Tom Maker has founded Maker Audio and has continued his path of building the great solid state amp designs (and speakers as well). His new NL14 and NL14+ (and G9) designs have garnered some extremely positive feedback that's out there; I've also talked to people who heard them in person a while ago at a show and they told me they have killer audio performance that they believed was well above the levels already established with the 12.1 and 10.1 offerings...