AirTight 300B Reference Stereo Amplifier: Legendary Air Tight ATM300R.

At True Audiophile

NOTE: Due to people playing with tube brands, the Stock price is w/o tubes

AirTight's new 300B amp, the 300R has all the qualities of the Anniversary 300B and then some: The 300R has a firmer bass response and is 9 watts per channel vs the 300 Anniversary. Separating sentimentality, this is a superior amplifier. Handcrafted in Japan and rated at 9Wpc

AirTight ATM-300R features new step-up transformers and Takatsuki 300B tubes ($2500.00 value) hand-blown by Kyoto craftsmen to precise specs that are hand-matched to plus or minus 1 percent. These tubes were chosen by Mr. Miura for their longevity, reliability, and consistency of sound quality

We are very honored to be able to offer this amp to our customers. -- True Audiophile mini review

Stereophile says:

The Air Tight ATM-300R spent a lot of time in my system chained to a chore no sane man or woman would think fair: playing, four times in a row, the historic recording by Georg Solti, the Vienna Philharmonic, and a cast of soloists headed by Kirsten Flagstad and George London, of Wagner's Das Rheingold (3 LPs, London OSA 1309). As it happens, a recent thread on Facebook had prodded me to re-read producer John Culshaw's book Ring Resounding, about his production of that historic first complete recording of Rheingold and, ultimately, Wagner's entire Der Ring des Nibelungen. The Air Tight amp reproduced it so gloriously well that, for the next couple of days, one or the other of the set's three LPs was always on my turntable.

Read Stereophile's full review

6Moons states:

One of those is incredible microdynamics and low-level resolution which do not exist anywhere in that form. The ATM-300 was no exception. Each disc - and I listened to this beautiful amplifier extensively- was presented with an extremely well-defined soundstage. I am not even talking size (this is a secondary issue with this amplifier whose virtual stage is very large but not blown out of proportion) but how instruments, voices and effects were defined within the soundstage boundaries. The Air Tight positioned them all in a very natural way, slightly soft but not softened, simply not hard. Whether a large church like Missa Criolla with José Carreras or the interior of a recording studio from June Christy’s Something Cool or the artificial effects from the newest Depeche Mode single, in each instance the ability to present the stage as a whole as well as its details in particular - by letting us know what roles they played in the creation of the sound - was truly outstanding.

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Air Tight ATM-300R Stereo Amplifier features:

Legendary musical charms of jubilee-long reputed, genuine Takatsuki direct-heated valve
Takatsuki 300B Output Tubes. Finest 300B tubes made today
New set-up transformers
Self-biased Class-A operation at WE-300B output stage
3-stage triode amplification for sublimate musicality
DC-driven heater to reduce noise inherent in direct-heated valve
Bias/current meter to check optimum operation of output valve
Damping selector control to create one’s favorite sound
Lavish employment of second-to-none, custom selected components
Copper-plated chassis to remove magnetic distortion
Attenuator on direct-CD input