Adcom GFA-7400 User Manual

Fuse replacement GFA-7400:
To remove the fuse-holder cap, you will need a %” standard flat-blade screwdriver. Place the
screwdriver in the recessed slot in the cap. Turn the cap Vs-turn counter-clockwise, until the cap
pops out towards you. Grasp the cap with your fingers and pull it completely out. The fuse is
inserted in the back of the cap; gently pull it free.
Since the fuse has a ceramic body, you cannot visually examine the fuse element, it is therefore
suggested that you replace it with an identical substitute or bring the fuse to your Adcom dealer
so they may check its integrity. To replace the fuse, insert it in the back of the fuse-holder cap.
Place the cap into the fuse-holder. Place the screwdriver in the recessed slot, gently press in and
turn V8-tum clockwise.
Fuse replacement GFA-7300:
To remove the fuse-holder cap, you will need a #2 Philips type screwdriver. Place the screwdriver
in the recessed slot in the cap. Turn the cap counter-clockwise, until the cap pops out towards
you. Grasp the cap with your fingers and pull it completely out. The fuse is inserted in the back of
the cap; gently pull it free.
Replace it with an identical substitute or bring the fuse to your Adcom dealer so they may check
its integrity. To replace the fuse, insert it in the back of the fuse-holder cap. Place the cap into the
fuse-holder.. Place the screwdriver in the recessed slot, gently press in and turn clockwise until
fully inserted, being careful not to over-tighten.
e AC Power Cord
The AC cord provides power to operate all the GFA-7400 and 7300’s circuits. Its plug can
be connected to a standard wall outlet provided the outlet supplies a voltage compatible with the
power requirements printed on the rear panel of the GFA-7400/7300.
The GFA-7400 and 7300’s power cord is supplied with a “polarized” AC plug as required by
UL/CSA standards and the National Electrical Code. To minimize the risk of electrical shock and
to insure minimal hum from the system, do not defeat the polarity insuring feature of the plug (one
wide blade and one narrow blade). To prevent electrical shock, do not use this polarized plug
with an extension cord or AC outlet unless the blades can be fully inserted to prevent blade
exposure.
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Adcom GFA-7400 Specifications

Power

continuous power per channel into 8 ohms	100 watts
continuous power per channel into 4 ohms	150 watts
power consumption quiescent	96 VA
maximum power consumption	1440 VA
power consumption at 100 watts into 8 ohms	1165 VA
power supply voltage	115 VAC - 50/60 Hz

Distortion

IM distortion SMPTE at 8 ohms	≤ 0.075%
IM distortion SMPTE at 4 ohms	≤ 0.075%
IM distortion CCIF at 8 ohms	≤ 0.025%
IM distortion CCIF at 4 ohms	≤ 0.025%
THD + noise at 100 watts into 8 ohms at 20Hz	0.0012%
THD + noise at 100 watts into 8 ohms at 1kHz	0.0012%
THD + noise at 100 watts into 8 ohms at 10kHz	0.02%
THD + noise at 100 watts into 8 ohms at 20kHz	0.025%
THD + noise at 150 watts into 4 ohms at 20Hz	0.025%
THD + noise at 150 watts into 4 ohms at 1kHz	0.025%
THD + noise at 150 watts into 4 ohms at 10kHz	0.035%
THD + noise at 150 watts into 4 ohms at 20kHz	0.045%

Performance

frequency response at 1 watt into 8 ohms	+0, -0.25 dB
power bandwidth	1.5 Hz to 65 kHz
dynamic headroom into 4 ohms	2.5 dB
signal to noise ratio	≥ 110 dB
gain	29 dB
input sensitivity for 1 watt	0.1 volts
input sensitivity for 100 watts	1.0 volts
input impedance	50 kΩ
damping factor	≥ 400
rise time	4.5 µS

Weight and Dimensions

chassis dimensions	5” (127mm) x 17” (432mm) x 14” (355.6mm)
maximum dimensions	5 3/4” (146mm) x 17” (432mm) x 15” (381mm)
weight	42 lb. (19.1 kg)
packed weight	48 lb. (22.8 kg)