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OperationIMPORTANT: Before plugging the amplifier into an AC outlet, turn all volume
controls to their full counterclockwise positions and all other controls to their
reference position or to mid rotation.
POWER IND The POWER IND LED illuminates whenever AC power is applied to the amplifier
(there is no power switch on the amplifier).
PEAK LEVEL The PEAK LEVEL LED illuminates whenever the speaker output signal level
approaches its maximum level. This indicator is used when setting volume levels.
Maximum output level is achieved when the PEAK LEVEL indicator flashes
intermittently on loud peaks of the input signal.If the indicator illuminates steadily,
the output signal volume is set too high and distortion is occurring. Decrease the
volume control for the appropriate input until the indicator flashes only
occassionally.
TEL VOLUME This control adjusts the level of the telephone page output. A reference level setting
position is provided with this control. When set to this position,the output level of
the page should be about maximum. Further adjustment can be made using the
PEAK LEVEL indicator described above.
ALC The ALC controls the level at which the amplifier will begin to limit the output signal
level. A reference setting position is provided for this control. Normally, the
reference position provides optimum performance;however,if further adjustment is
desired,use the following steps for setting the ALC control.
Manual Output Adjustment Procedure(follow only if minor adjustments to the
reference settings are not adequate)
1) Disable ALCby turning ALC control.
2) Make a page, speaking softly,yet distinctly.Set the TEL VOLUME control to the
desired paging level during this page.
3) Make another page speaking relatively loudly this time.Rotate the ALC control,
while making the page,until it has the same loudness as the first page.
NOTE: The TELVolume and ALC controls work together to set the output level.
When both controls are set to the reference positions,the amplifier provides a
nominal 70V signal output (optimum).
NOTE: The PEAK LEVEL indicator should not show excessive peaking during loud
pages.If this is occurring, the ALC control must be further increased.