Break In Period .......................................................................................................................................................................... 47
Tube Life..................................................................................................................................................................................... 47
Changing Tubes.......................................................................................................................................................................... 48
Cleaning ..................................................................................................................................................................................... 52
Troubleshooting.......................................................................................................................................................................... 52
....................................................................................................................................................................... 55
.......................................................................................................................................................... 55
....................................................................................................................................................................... 57
................................................................................................................................................................. 57
......................................................................................................................................................................... 58
Warranty Registration ................................................................................................................................................................ 61
Service Notes .............................................................................................................................................................................. 61
S-400 Amplifier Owner's Manual
VTL
.................................................................................................. 47
iii