Az S-400 címszó alatt minden megtalálható, amit műszakilag erről az erősítőről tudni kell, hiszen az S-400-s mono változata. A hangja pedig egyszerűen fenomenális.
| Vacuum Tube Complement | 12 x 6550 or KT-88, 1 x 12AT7, 2 x 12BH7 |
| Output power 20Hz – 20kHz <2.5% THD |
Tetrode: 650W, Triode: 330W Into 5Ω |
| Input sensitivity | Variable between 1-2V, depending upon DF setting |
| Input impedance | 45kΩ |
| Load setting | 5Ω |
| Optimum load range | 4Ω – 8Ω |
| S/N Ratio | -110dB, 120 Hz |
| Power consumption | Idle = 600W, Full power = 1500W |
| Primary mains fuse ratings | 100/120V = 20A Ceramic Slo Blo, 220/240V = 10A Ceramic Slo Blo |
| Logic fuse | 100/120V = 1A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo |
| Input fuse | 100/120V = 2A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo |
| Filament fuse | 100/120V = 2A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo |
| Secondary fuse rating | Plate Fuse = 5A fast acting 600V, Screen Fuse = 0.75A fast acting 600V |
| Dimensions W x D x H | 11.5 x 24 x 24 inches (29.2 x 61 x 61 cm) |
| Weight | 200lbs (90Kg) per monoblock unpacked, 325lbs (147Kg) packed |