TABLE OF CONTENT
CHAPTER 1
......................................................................................................................................................................... 1
I
NTRODUCTION
.............................................................................................................................................................. 1
The Origin of the MB-450 Signature Monoblock Amplifier ......................................................................................................... 1
Circuit overview: .......................................................................................................................................................................... 2
Symbol Conventions used in this guide......................................................................................................................................... 3
Electrical Safety Notice ................................................................................................................................................................ 3
Water and Moisture ...................................................................................................................................................................... 3
Location and Ventilation .............................................................................................................................................................. 3
Servicing ....................................................................................................................................................................................... 4
Operational Warnings .................................................................................................................................................................. 4
CHAPTER 2
......................................................................................................................................................................... 6
G
ETTING
S
TARTED
........................................................................................................................................................ 6
Before starting .............................................................................................................................................................................. 6
Replacing tubes............................................................................................................................................................................. 6
Connecting Your Amplifier to your system ................................................................................................................................... 9
Voltage Setting............................................................................................................................................................................ 10
Power Source for your Amplifier................................................................................................................................................ 10
CHAPTER 3
....................................................................................................................................................................... 11
O
PERATING THE
A
MPLIFIER
........................................................................................................................................ 11
Turn On to Standby Mode........................................................................................................................................................... 11
From Standby Mode to Power On Mode .................................................................................................................................... 12
Mute and Unmute ....................................................................................................................................................................... 13
Tetrode /Triode Switching .......................................................................................................................................................... 14
Deck and Deck LED Indications ................................................................................................................................................ 15
Power off the amplifier into Standby mode................................................................................................................................. 17
Power off the amplifier at the rocker switch............................................................................................................................... 17
Using the DF switches ................................................................................................................................................................ 17
DF Switch Settings
..................................................................................................................................................................................18
Fault indication .......................................................................................................................................................................... 20
Tube Fault .............................................................................................................................................................................................................20
1. Tube red Fault - Mute LED blinking Red, deck LED green
.................................................................................................20
2. High Current TUBE Fault -- Mute/Power/Mode LEDs off, deck LED green
...............................................................21
3. TUBE green Fault -- Mute LED blinking green, deck LED green
.....................................................................................21
Power Fault -- Mute LED blinking fast red, no deck LED lit ..............................................................................................................................23
Replacing tubes........................................................................................................................................................................... 23
Resetting a Tube Red Fault......................................................................................................................................................... 26
Reset High Current Tube Fault .................................................................................................................................................. 27
Clearing a green tube Fault ....................................................................................................................................................... 27
Trigger functions ........................................................................................................................................................................ 27
Power On Trigger..................................................................................................................................................................................................27
Using a 12V trigger to power the amplifier on or off.......................................................................................................................................27
Mute Trigger .........................................................................................................................................................................................................28
Mode Trigger.........................................................................................................................................................................................................28
CHAPTER 4
........................................................................................................................................................................ 29
C
ARE AND
M
AINTENANCE OF YOUR
VTL A
MPLIFIER
................................................................................................. 29
Break In Period .......................................................................................................................................................................... 29
Power-on Period......................................................................................................................................................................... 29
Tube Types.................................................................................................................................................................................. 29
Tube Life..................................................................................................................................................................................... 29
Changing the Screen, Plate, Mains, Logic, B+ Input Fuses....................................................................................................... 30
Cleaning ..................................................................................................................................................................................... 31
Transporting MB-450 ................................................................................................................................................................. 31
MB-450 Series III Signature Monoblock Owner’s Manual
ii
Troubleshooting.......................................................................................................................................................................... 32
