Air Tight ATM-1S
Image source — © Air Tight
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Model name
ATM-1S
Input sensitivity (mV)
1000
Input impedance (balanced) (Ω)
100 000
Input impedance (single-ended) (Ω)
100 000
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
Max current (A)
N/A
Output power (8Ω) (W)
2 x 36
Output power (4Ω) (W)
N/A
Gain (dBu)
N/A
Frequency response low +/- 3dB (Hz)
N/A
Frequency response high +/- 3dB (Hz)
N/A
Signal to Noise Ratio (dB)
N/A
Total Harmonic Distortion + Noise (0% global feedback) (%)
N/A
Total Harmonic Distortion + Noise (100% global feedback) (%)
N/A
Max power consumption (W)
N/A
Damping factor
N/A
Dimensions (mm)
368 × 293 × 231
Weight (kg)
22
Official link
A high-end two-stroke ATM-2 tube amplifier from the legendary Japanese company Air Tight, built on the basis of 6550/KT-88 lamps. The amplifier does not have printed circuit boards - all wiring is 100% manual and made using audiophile wires using high-quality silver solder.
The Air Tight ATM-300R runs on 300B lamps and has a copper-coated chassis, the power figures have not changed relative to the previous model - the device outputs 2 x 8 watts.
New 2024 updated version of Air Tight ATM-1 (1986) and ATM-1s (2006) offers he EL-34 push-pull circut and 2 x 35 W power rating.