Official info about the new ($80.000) Air Tight ATM-3211 flagship Triode monoblock power amplifiers…
Air Tight writes: “We may define that the triode is the primitive form of every vacuum tube. Although people might imagine that the triode is left behind the 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. As greedy as it is, this ATM-3211 has been in research for more than 5 years if such simple and vivid triode charm can be realized even for the low efficiency speakers by means of 100w exceeding push-pull circuit.

The circuit configuration is as follow:
  • 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 employed
  • High 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 aluminum front panel is scraped out by hand workWBT input and speaker terminals are employed.Wiring and soldering are all done by hand.
  • 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