Originally Posted by Nik 
Hi Neil,
I have for 5 times the K1000, the first one was on eof the firts produced, I always sold them afetr some amps tested (BAT hybrid with 6h30 integrated, Electrocomaniet, Copland, McCormak, and others). One of latest times I had the K1000 with a Leben CS-600, a 30 watt class A with 6sl6gc a push pull amp that was very, very good. But I have sold the K1000 the same...
At the end I have bought one more K1000 and the beautiful Cary with some special tubes for it... I used this setup for a "long" time, respect to the precedents times... The Cary helped me to understand that the SET 300B was the answer for the K1000 (IMHO). So I was decided to invest a lot of money to have the very best SET 300B amp, I think that this is the Air Tight, someone told me that this amp is even better than AudioNote or AudioTekne... you know?
Good, I had the possibility to listen the Air Tight and I was amazed with it... Then I had a long time to "tune" the amp for my cans: cables, tubes, especially. I have worked a lot and for some mounts just to find "the perfection", I was ready to invest all my energy to do this. After the tubes (many, many tubes selected), the IC was the problem. The new top of the line Acrolink solved this "problem" and gave me all what I was researching.
Good, the sound of this power amp is unconventional if you think to other of the same SET 300B as the very good Cary, for example. The Air Tight has twice the fast, dynamic an tight (as his name tells). The bass is mucth better than the Cary, details and trasparence is also outstanding. It was too dynamic for my ears, and I have decided to have less dynamic with the control of the gain selector in a low position (a bit of feedback added).
The Air Tight is a very minimalist concept amp, this is a power amp, not an integrated, so you have jut one only in (RCA) and two volume pots on the in. The output transformers are made by Tamura, look and construction are the best I have seen untill today. Weight is aorund 25 kg ! The boottom is pure cooper (heavy coopper).
The tubes are WE300B, Mullard 12au7 long plate 1955 cryo, Mullard 5as4 and RCA 12bh7a, an incredile set. If you know the sound of the WE 300b think this sound at the highest level listened with a K1000, so the most romantic sound matched with the dynamic and the power of the K1000, hard to describe. You know the K1000 surely it is not the most "romantic" cans... and just for this they need that kind of amp...(IMHO), but do not think a typical tubey sound, think to a very strong performances united to a incredible heart...
I hope you will understand my low english... but I'm so enthusiast for this sound...
I Think that the Orpheus as a perfect match between the cans and the amp, I would like to adfirm that the K1000 now has his big companion called Air Tight ATM-300... this is my experience.
But all the components (from to power cables to my ears) are tuned specifically for the K1000, this is also very important in this experience.
All my friends (headfiers of Italy) who have listend to this setup, and they knew all my setups, said that this is surely the very best one, I'm also of the same opinion... better of any Qualia, Omega II, L3000, PS1, RS1, R10 and many others... One of these guys has the big Avalon speakers in his house !!!
Just my two (or 3 ) cents...
Best regards!
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