AIR TIGHT ATM-3211 MONO-POWER AMPLIFIER
At last, unfinished dream came true;
Astounding 120W output from exquisite 211 Triode push-pull circuitry!!
In 2001, we Air Tight introduced the ATM-211 that delivers hefty 22W output power by means of SET circuit of the transmission triode valve 211. We all were drunk with the unexcelled charm of overall tonal quality inhering in the
211 tube, while it’s also true that all of tube-sound enthusiasts have been longing for high output exceeding 100W/CH with the 211 therein employed.
Now in 2017, our ambitious challenge to let the 211 in skilled push-pull configuration yield such gigantic power output was rewarded in the form of the new mono-block ATM-3211, as a result of unyielding 5 years’ patience with uncompromising spirit and unsparing investment in engineering cost.
Please enjoy the outstanding, intrinsic sonic features and characteristics of the Triode 211 vacuum tube; both in graceful delicacy in pianissimo and clear saturation-free representation in fortissimo!. We may define that the triode is the primitive form of every vacuum tube. Although people might imagine that the triode is left behind in todays modern era, on the other hand still there are some persistent triode lovers. Yes, we, Air Tight are one of such triode lovers. Starting from ATM-300 of 300B and ATM-211 of transmission tube 211 to the latest ATM-300Anniversary of our 30 years anniversary. The ATM-3211 has been in research for more than 5 years resulting in vivid triode charm even for low efficiency speakers by means of 100w exceeding push-pull circuit.
The circuit configuration is as follows:
1st stage: differential circuit of 12AX7
2nd stage: 12BH7
Cathode-follower 12BH7 parallel
A-class operation up to 30W
AB-class operation for more than 30W
Wide frequency range is obtained by NFB circuit (Frequency response 10Hz～50ｋHz ±１ｄB)
Massive Tamura’s output transformer is employedHigh and low 2-compositions transformer ensure instantaneous power supply and prevent power interference.
High grade capacitors and resistors are employed for the key locations learned in years’ development.
15mm thick aluminium front panel.
WBT input and speaker terminals are employed.
Wiring and soldering are all done by hand - point to point.
SPECIFICATIONS
Valves employed: 12AX7 x 1, 12BH7 x 3, 211 x 2
Rated output: 120W (6Ω/THD2%)
Frequency response: 10Hz~50kHz (±1dB/THD0.06%)(at 1kHZ/30W)
Damping factor: 6(1kHz/1W)
Input sensitivity: 1V/Input impedance 100kΩ
Power consumption: 550VA
Load impedance: 6Ω/16Ω(Interchangeable, 6Ωstandard)
Dimensions: 400(W) x 450(D) x 405(H) mm
Weight: 44kgs
More info at airtight-anm.com