Fostex 600 - OPERATION; Initial Setup and Power On; Level Control and Calibration

OPERATION
After all connections have been made to the power amplifier, turn the level controls fully
counter-clockwise (-<»dB).
Turn on the preamplifier, then turn on the power amplifier.
The red POWER L.E.D. indicator light on the front panel should light. If it does not, check to see
that the amplifier is plugged in to a live power outlet.
With preamplifier level controls fully off, advance the CHANNEL 1 and CHANNEL 2 power
amplifier level controls about half way clockwise (slot in knob facing upwards). There should be
no audible hum; if hum is heard, check the connections between the power amplifier and
preamplifier. Now advance the preamplifier level controls until the desired maximum volume is
achieved. Should the preamplifier level control be in excess of the 3/4 setting, decrease it to half
volume and increase the level control of the power amplifier to the desired level.
The front panel L.E.D. level indicators are calibrated when the level indicator shows OdB, at that
time, the peak output voltage should be at 40'/2 volts (in case of model 600) or 40 volts (in case
of model 300).
If full power output is unobtainabife, check to see that the preamplifier is capable of producing
the required driving voltage as stated in the Specifications Section.
The amplifier incorporates a time delay network and a relay which connects the speakers only
after the amplifier has stabilized thus eliminating transients.
Often, turn-on transients originate in the pre-amp or tuner.
This is especially true of tube-type units. If this situation arises, turn the amplifier on after the
other units have had adequate time to stabilize.