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Power amplifiers stereo — Air Tight ATM-1S
Description, images, technical data and specifications
Air Tight ATM-1S
Image source — © Air Tight
The Air Tight ATM-1S is a stereo valve power amplifier using four 6CA7/EL34 output tubes, two 12AU7 and one 12AX7.
Key specs that matter
Output is 36W per channel into 8 ohms, with 4, 8 and 16 ohm load settings changed by internal wiring (8 ohms from the factory). Input sensitivity is 1V and input impedance 100k ohms. Frequency response is 20Hz to 20kHz within 1dB. Distortion is 0.1% at 1kHz and 1W, rising to 1% at the full 36W, while S/N reaches 100dB A-weighted. The chassis measures 368 mm wide, 293 mm deep and 231 mm tall, and weighs 22 kg.
Pairing
With its moderate output from EL34 valves, the ATM-1S suits loudspeakers of reasonable sensitivity rather than difficult low-impedance loads.
Alternatives
Air Tight also offers the ATM-1 2024 edition, a later stereo EL34 power amplifier rated at 35W per channel.
Key specs that matter
Output is 36W per channel into 8 ohms, with 4, 8 and 16 ohm load settings changed by internal wiring (8 ohms from the factory). Input sensitivity is 1V and input impedance 100k ohms. Frequency response is 20Hz to 20kHz within 1dB. Distortion is 0.1% at 1kHz and 1W, rising to 1% at the full 36W, while S/N reaches 100dB A-weighted. The chassis measures 368 mm wide, 293 mm deep and 231 mm tall, and weighs 22 kg.
Pairing
With its moderate output from EL34 valves, the ATM-1S suits loudspeakers of reasonable sensitivity rather than difficult low-impedance loads.
Alternatives
Air Tight also offers the ATM-1 2024 edition, a later stereo EL34 power amplifier rated at 35W per channel.
Specifications
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
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