AIR TIGHT ATM-1S
¥ 441,000 (tax included, released in 2006)
Commentary
This tube type stereo power amplifier was developed as an anniversary model to commemorate the 20th anniversary of the foundation.
The circuit configuration is based on a reliable and orthodox circuit that exhibits 100% of the advantages of NFB and 6CA7 by Mulard type phase inversion and UL connection. Circuits that cause distrust in unstable long-term use are eliminated as much as possible.
The output transformer is used in combination with a large transformer to protect further head room and achieve stability with allowance.
The front is equipped with a CD direct connection terminal, allowing direct connection to the first stage tube.
The power supply section has been strengthened and stability has been improved by increasing the capacity of the output transformer.
The signal system is hand-wired without using any boards, and the wiring material is used at every important point.
Equipped with a meter and volume for bias adjustment.
To adjust the bias, first turn ON the SW to the lowest VR level and wait for approximately 5 minutes until the EL34 (6CA7) operates. The arrangement of the EL34 (6CA7) is left CH V1/V2 and right CH V3/V4.
Next, set the Bias Tests switch from Operate to V1, turn the Bias Adjust volume of V1 into the Bias position of the meter while looking at the Bias Meter, and set the Bias Tests switch to V2/V3/V4.
Finally, turn the Bias switch to confirm that V1 to V4 are in the same position.
.jpg)
Model Rating
| Type | Stereo power amplifier |
| Effective power | 36W + 36W (8 Ω) |
| Total harmonic distortion factor | 0.1% or Less (1 kHz, 1W) 1% or Less (1 kHz, 36W) |
| Frequency characteristic | 20 Hz ~ 20 kHz ± 1 dB (36W) |
| Input sensitivity | 1V |
| Impedance | 100k Ω |
| Signal-to-noise ratio | 100 dB (IHF-A, input short) |
| Load impedance | 4 Ω, 8 Ω |
| Vacuum tube used | 6CA7x4 12AU7x2 12AX7x1 |
| Power consumption | Approx. 250W |
| External dimensions | Width 368x Height 293x Depth 231 mm |
| Weight | 22kg |