AIR TIGHT ATM-1
¥ 330,000 (released in 1986)
Commentary
This is a bulb-tube type stereo power amplifier designed using reliable parts along with the progress of modern electronics while taking full advantage of the characteristics of vacuum tubes.
The circuit structure is NFB by Mulard type phase inversion and UL connection. It is based on the reliable orthodox circuit which demonstrates the advantage of 6CA7, and the circuit which causes distrust in unstable long-term use is eliminated as much as possible.
A rectifier tube is used to protect the power tube from the rush current when the AC power is turned on, while maintaining the sound quality of the vacuum tube.
In addition, 5AR4 is connected in parallel so that it can withstand large currents.
Printed circuit boards, which affect sound, are eliminated, and all of them are hooked up to terminals for manual wiring.
The CD direct connection terminal is mounted on the front panel.
This terminal can be directly connected to the first stage tube.
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Model Rating
| Type | Stereo power amplifier |
| Effective power | 36W + 36W (8 Ω) |
| Total harmonic distortion factor | 0.1% or Less (1 kHz, 1W) 1.0% 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 5AR4x2 |
| Accessory function | Input 2-system switching SW |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | Approx. 250W (Electrical Appliance and Material Control Law) |
| External dimensions | Width 368x Height 298x Depth 231 mm |
| Weight | 22kg |