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Warnings about electric shock, opening the unit, lightning symbols, and polarized plugs.
Instructions on unit placement, ventilation, heat source avoidance, and power cord routing.
Avoid water/moisture, clean as instructed, unplug when unused, prevent object/liquid entry.
Servicing by qualified personnel only, outdoor antenna grounding requirements.
Manual helps understand correct operation, features, and functions for maximum performance.
GFA-585 is stereophonic version of GFA-565, known for superb performance into difficult loads.
Caution with connections due to high peaks; disconnect power, discharge capacitors (up to 5 min).
Amplifier drives low impedance/reactive loads well, maintaining low distortion, unlike some designs.
Triple-Darlington output, no protection circuitry, massive power supply, and anti-sticking circuit.
Minimizes sonic deterioration, allows DC amplification, and reduces DC offset.
Double-differential cascode stages regulated for optimal low-level operation.
Uses OFC wiring, high-grade parts, and fine film capacitors in critical circuits.
Read Limited Warranty card for details, limitations, and benefits.
Verify serial numbers match; notify ADCOM if altered or missing.
Inspect for damage; save packing materials for claims; notify dealer immediately of damage.
Ensure adequate air circulation for heatsinks; keep away from heat sources and obstructions.
Avoid stacking components; use vented cabinets; ensure top/bottom/side slots are clear.
For demanding loads; consists of a top plate with a variable cooling fan; easily installed.
Use optional adaptors; insulate chassis from metal rack rails to prevent ground loops.
Ensure power is OFF, cord disconnected, and components off before making connections.
Use high-quality, low-capacitance RCA cables for unbalanced inputs; 50k ohm impedance.
High-grade 5-way binding posts for loudspeakers; connect LEFT/RIGHT correctly.
Connect polarity correctly; use appropriate AWG wire gauge based on length.
Low capacitance cables are crucial; test loudspeaker phasing for correct stereo image.
Illustration of rear panel connections including inputs, outputs, and fuses.
Use banana plugs, spade lugs, or tinned wire; handles loads down to 2 ohms.
Paralleling speakers lowers impedance; may trigger thermal protection or blow fuses.
Test phase using mono audio; reverse leads if image is imprecise or shifts.
Protect output stages; blown fuse indicated by POWER LED glowing, no audio.
Wait 5 minutes after power off before connecting/disconnecting speakers to prevent fuse blows.
Amplifier protects reliably; other circuits may degrade audio; avoid abuse.
Do not connect while ON or use 'thumb test' to prevent damage.
Use only specified fuse types; substitutes can cause damage, fire, or void warranty.
Use Phillips screwdriver, turn cap counterclockwise to remove; reverse for replacement.
Heavy-duty cord; use dedicated 15A/20A branch circuit for best performance.
Protects circuits; POWER LED not glowing may indicate blown fuse.
Unplug cord before replacing; use correct types; check for repeat blowing.
Approved fuse types listed for 120VAC/60Hz operation.
Controls power to transformer and circuits; push top to ON, bottom to OFF.
Indicates power ON; does not confirm all circuits operational; affected by AC fuse/DC fuses.
Internal thermostat protects transformer; resets automatically when cool.
Diagram showing power, LEDs, and channel indicators on the front panel.
Detects various distortions; LEDs light at 1% distortion, flicker normally at high volume.
Bright LEDs indicate overdriving; lower volume to prevent damage or fuse blows.
Shuts down amplifier if heatsink reaches 85°C; LED indicates activation.
Caused by high power/low impedance; prevent by reducing volume or installing FAN OPTION.
No power and no thermal LED may indicate a blown AC LINE FUSE.
Clean panel with damp cloth; do not spray liquids or expose to moisture.
Contact ADCOM Technical Service for questions or difficulties.
Requires Return Authorization; ship prepaid via UPS/approved carrier; no Parcel Post.
250W/8 ohm, 400W/4 ohm ratings; THD+N, IM distortion values provided.
Frequency response and power bandwidth specifications.
Dynamic headroom, signal-to-noise ratio, and gain specifications.
Input impedance, sensitivity, damping factor, and rise time specs.
Semiconductor complement, power consumption, and dimensions/weight.
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