A TL-7.5 méltó párja, mindent tud, amit ezen a szinten egy erősítőnek tudni kell. A VTL S-400 referencia végerősítő tesztjét itt tölthetik le pdf formátumban.
| Vacuum Tube Complement | 12 x 6550 or KT-88, 2 x 12AT7, 2 x 12BH7 |
| Output power | Tetrode = 300W, Triode = 150W |
| 20Hz – 20kHz <3.5% THD |
Into 5Ω |
| Input sensitivity | Variable between 1 – 2V, depending upon DF setting |
| Input impedance | 48kΩ |
| Load setting | 5Ω |
| Optimum load range | 4Ω – 8Ω |
| S/N Ratio | -90dB, 120Hz |
| Power consumption | Idle = 560W, Full power = 1600W |
| B+ fuse ratings | 100/120V = 20A Ceramic Slo Blo, 220/240V = 10A Ceramic Slo Blo |
| Logic fuse ratings | 100/120V = 1A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo |
| Input fuse ratings | 100/120V = 2A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo |
| Filament fuse ratings | 100/120V = 2A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo |
| Secondary fuse ratings | Plate 2.5A Fast acting 600V, Screen 0.75A Fast acting 600V |
| Dimensions W x D x H | 11.5 x 24 x 24 inches (29 x 61 x 61 cm) |
| Weight | Net: 250lbs (113Kg), 350lbs (159Kg) |