Front Panel Controls And Indicators; Front Panel Controls; Front Panel Indicators - VTL S-400 II series Owner's Manual

(INVERTed). To switch to Phase 0 (Normal) and set the amplifier to phase correct from input to output, lift the Phase
switch up. The front panel light is off when set to Phase 0 (Normal).

Front panel controls and indicators

Front Panel Controls

There are three visible buttons on the front panel which can perform the most common control functions for the
amplifier. Each button is labeled and also has a corresponding light to display the status of the button:
POWER: The red POWER button in the middle of the row is used to toggle the amplifier between power
on or off, from and to the standby mode. The POWER light flashes blue during power up, and glows steady
blue when powered up into operating mode.
MODE: The MODE button on the left of the row is used to select the operating mode of the amplifier,
either Tetrode mode (green light) or Triode mode (red light). The MODE can be selected while the amplifier
is in operating mode only.
MUTE: When the amplifier is powered up, pressing the MUTE button on the right of the row toggles
the amplifier between MUTEd, low current state (no output), indicated by a steady red MUTE light, and
operating state, when the light is off. During the unMUTE process the MUTE light flashes red until the
amplifier is getting ready to automatically unmute.

Front Panel Indicators

The Display window above the buttons contains the numeric display and a group of five text indicators. The back-
lit text is not visible unless either activated by the user or by the amplifier to indicate status. The signaling
convention used is red for critical warning and green for non-critical warning, while flashing indicates a fault
S-400 Amplifier Owner's Manual
VTL
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