Air Tight ATM – 2

Planet Audio
  • A superb piece by any standard, the ATM-2 uses KT-88 output tubes. (The ATM-2s are outfitted, at the factory, with 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 re-matching, 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 attenuates for level control.    
      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, though we recommend easier loads (like Tannoy speakers). 80 Watts per channel of pure tube bliss!
  • Renowned KT-88 / KT-120 output valves for high power
  • Bias adjuster for optimal operation of output valves
  • Cathode follower direct drive circuitry under UL connection
  • Total hand-wiring without PCB’s
  • Full OFC wiring with copper-plated chassis and bottom plate
  • Dependable Tamura output transformers with large input capacity exceeding 100W
  • CD direct input enabling unimpaired digital reproduction
Form Stereo power amplifier
Effective output 80W+80W (8ohms)
THD 0.07% or less (1kHz, 1W)
1.0% or less (1kHz, 80W)
Frequency response Less than [ 20Hz-20kHz±1dB ] (80W)
Input sensitivity 1V
Impedance 100kohm
Signal to noise ratio 100dB (IHF-A, input short-circuit)
Load impedance 4ohm, 8ohm
An attached mechanism Input selector
Bias adjustment mechanism
Valves employed 12AX7A: Two pieces
12AU7A: Two pieces
12BH7A: Two pieces
88:4 KT(s)
Power supply voltage AC 230 V
Power consumption About 300W (Electrical Appliance and Material Control Law)
Dimensions Width 415 x height 223 x depth of 380mm
Weight 32kg