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Air Tight Amplifiers
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The Air Tight ATM-2 Stereo Amplifier
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One of our reference amps here at the Tweak Shop. A superb piece by any standard, the ATM-2 uses KT-88 output tubes. (The ATM-2s are outfitted, at the factory, with Chinese KT-88s that have gone through a rigorous burn-in procedure. This consists of preliminary testing for defects and overall selection for sound and performance matching, after which the tubes are placed in an ATM-2 on the test bench and run continuously for 100 hours. This is followed by further testing and rematching, after which they are again placed in an ATM-2 and run for another 100 hours. The tubes are then matched to a specific ATM-2 from the production line. Set-up and tube biasing are a snap. There are even two sets of inputs, allowing you to use a line-level source, i.e., CD player, directly into the amplifier using the amps left and right attenuators for level control |
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| None of this would mean anything except that the ATM-2 sounds as good as it's built: exceptionally clean, with a clear, lifelike midrange, extended (but smooth) top end with outstanding resolution of detail, and big, dynamic low frequencies that would make some folks think they're listening to a big solid-state amp! We've used the ATM-2 on speakers with fairly low efficiency (86dB/Watt) without problem, although they really shine with easy loads (like most of the Focal speakers). 80 Watts per channel of pure tube bliss! $12,000.00 |
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The Air Tight ATM-300 Stereo Amplifier
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This beautiful component is Miura-san's first foray into 300B tube amp production under the Air Tight logo. With the same approach to straightforward circuit design and layout and meticulous construction standards as his other offerings, the ATM-300 brings the magic of the legendary 300B triode tube to a new level of musicality. Using a single 300B per channel, the amp delivers 8 Watts per side of Class A triode purity (obviously, proper 'speaker selection is critical). Key to the superb performance is Mr. Miura's choice of the Tamura transformers for output power, making for stable, fuss-free operation (the unit is even self-biasing, although a handy bias-current meter lets you check up on the state of the tubes while playing). The amp also offers a 3-position (0dB, 4dB, 6dB) "damping control" to optimize negative feedback. The unit comes complete with Sovtek 300B EH Golds for $8,000.00. |
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ATM-1 36W Stereo Amplifier
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| When Mr. Miura first started the Air Tight company, this was his first all-new amplifier design. Time has not dulled its charms. Remarkable purity and musicality. Obviously, because of its lower power, careful choices should be made regarding appropriate loudspeakers. Call us for recommendations. $7,800.00 |
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ATM-3 55W/Triode - 110W/UL Monoblock Amplifiers
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| Mr. Miura's classic mono-block amplifiers. Designed to easily switch between pure, 55 Watts per channel triode operation (our favorite, most musically transparent mode) or 110 Watts per channel Ultra-Linear mode (for more demanding loudspeaker loads), the ATM-3s are, deservedly, Air Tights flagship amplifiers. $17,000.00 / pair. |
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