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when the amplifier is carelessly operated well beyond its limitations. Other types of
protection circuits, beyond the methods used in the GFA-565 amplifier, such as current
limiting, etc., usually result in deterioration of the audio performance of the amplifier.
While the GFA-565 will operate dependably in every normal situation, no amplifier is
impervious to abuse. There are conditions which must always be avoided if the amplifier is to
operate reliably and if triggering of protective devices is to be avoided. The preceding is
particularly true of amplifiers which have extremely wide audio bandwidth, such as ADCOM
amplifiers. Among the undertakings which must be avoided, if damage to the amplifier or to
the loudspeakers being used is to be prevented, are actions such as connecting the inputs
or outputs to or from the amplifier while the amplifier is ON, or using what has been
commonly termed the "thumb test" - that is, touching the center pin of the RCA jack on one
end of the audio interconnecting cable while the other end is plugged into the amplifier and
the amplifier is ON.
NOTE
In the event that the DC RAIL FUSES need to be replaced, only one of the fuse types listed
in the table below should be used. Please note that the fuses listed in the table, and their
time-current blowing points, have been carefully selected and thoroughly tested to deliver
optimal performance while still accomplishing their protective functions. Replace these
fuses, individually, only with the specific types listed. DO NOT USE ANY SUBSTITUTE
FUSES WITH DIFFERENT RATINGS, TIME-CURRENT CURVES OR VALUES. Failure
to observe this precaution may cause serious damage to the amplifier circuits, MAY
CREATE A FIRE HAZARD, AND MAY VOID YOUR WARRANTY. For your convenience,
a replacement set of two of the correct DC RAIL FUSES is supplied with each amplifier to
facilitate restoration of the amplifier to operation in the event of a blown fuse.
The GFA-565 has a massive power supply which remains charged for up to FIVE MINUTES
after the amplifier is turned off and the POWER LED ceases to glow. It also remains
energized when the POWER. LED glows even if the THERMAL PROTECTION LED is ON.
Therefore, you should exercise great caution when connecting arid/or disconnecting
loudspeakers to or from the RIGHT/LEFT STEREO SPEAKER OUTPUTS. Should you
inadvertently short out the RED ("+") and BLACK ("-") STEREO SPEAKER OUTPUTS,
enough power may remain in the power supply to cause sufficient current to blow the DC
RAIL FUSES on the affected channel. When connecting or disconnecting loudspeakers to or
from the RIGHT/LEFT STEREO SPEAKER OUTPUTS, always be certain to wait at least
FIVE MINUTES after turning the amplifier OFF before undertaking any such procedure.
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