Adcom MOSFET GFA-5802 - Manual (Page 3)

INTRODUCTION
Congratulations on your decision to purchase the GFA-5802 Stereo Power Amplifier. You have made a wise choice
that will reward you with exceptionally accurate and musical sound reproduction for years to come To realize the full potential
of your new amplifier, please read these operating and installation instructions thoroughly before attempting to connect it.
FEATURES
• Precision matched MOSFETs used throughout the signal path.
• Over 100,000 pF of power supply filter capacitance with low ESR for greater reserve capacity.
• Reduced number of gam stages improves signal reproduction accuracy.
• Custom toroidal power transformer with dual secondaries provides greater peak current capability.
• Separate front-end power supply complete with separate transformers.
• Dual High quality, gold plated binding posts.
• Independent thermal protection and distortion LED’s for each channel.
• Gold plated RCA jacks.
• Large external heatsinks for greater cooling capability of output devices.
• Heavy gauge, anodized aluminum front panel
• Powder coated, baked chassis and top cover for greater durability.
• Cooling vents on top cover for greater efficiency and cooler operation while driving low impedance loads
IMPORTANT NOTICE: ADCOM PROTECTION PLAN (USA ONLY)
ADCOM offers the enclosed valuable Limited Warranty. Please read the details on the Warranty Card carefully to
understand the extent of the protection offered by the Warranty, its reasonable limitations, and what you should do in order to
obtain its benefits. Be sure to verify that the serial number printed on the rear panel matches the serial number on the outer
carton. If any number is altered or missing, you should notify us immediately in order to ensure that you have received a
genuine ADCOM product which has not been opened, mishandled, or tampered with in any way.
UNPACKING
Before your new GFA-5802 left our factory, it was carefully inspected for physical imperfections and tested for all
electrical parameters as a routine part of ACCOM’s systematic quality control This, along with full operational and mechanical
testing, should ensure a product flawless in both appearance and performance After you have unpacked the GFA-5802,
inspect it for physical damage Save the shipping carton and all packing material as they are intended to reduce the possibility
of transportation damage, should the amplifier ever need to be shipped again. In the unlikely event damage has occurred,
notify your dealer immediately and request the name of the carrier so a written claim to cover shipping damages can be
initiated. THE RIGHT TO A CLAIM AGAINST A PUBLIC CARRIER CAN BE FORFEITED IF THE CARRIER IS NOT NOTIFIED
PROMPTLY IN WRITING AND IF THE SHIPPING CARTON AND PACKING MATERIALS ARE NOT AVAILABLE FOR
INSPECTION BY THE CARRIER. SAVE ALL PACKING MATERIALS UNTIL THE CLAIM HAS BEEN SETTLED.
PLACEMENT AND CARE OF THE GFA-5802
During normal home operation the heatsinks of the GFA-5802 will become very warm. However, there are instances
during high-level playback into low impedances when the heatsinks will become much warmer than usual. To ensure the
amplifier’s long-term, trouble-free operation, it is necessary to provide adequate ventilation for the heatsinks. Therefore, the
GFA-5802 should be kept away from external sources of heat such as radiators and hot-air ducts. The GFA-5802 should never
be placed with other heat-producing components in a cabinet or enclosure lacking free air flow
If you require that the GFA-5802 be mounted in an enclosed cabinet, it is recommended that the rear panel of the
cabinet be provided with ventilation openings at the top and bottom to allow air to circulate freely in the cabinet The top and
bottom panel of the amplifier’s chassis have been provided with vents to allow the necessary cooling of the internal
components. It is important that these vents are not obstructed in any way.
We recommend that you do not stack other components on top of the GFA-5802. This is particularly important If your
system includes low-impedance loudspeakers which are difficult to drive, or if you will consistently demand high volume levels
from the amplifier and speaker system. Not only will heat generated by the amplifier affect the performance of equipment
stacked on top of the GFA-5802, but the free flow of air through the ventilating slots in the amplifier may be partially obstructed
If you observe these recommendations, the GFA-5802 will perform reliably in any reasonable environment. You
should also pay attention to such normal considerations as protection from excessive dust and moisture. Occasional
vacuuming of accumulated dust on the chassis, heatsinks, panels and around the ventilating slots should be all that is
required
The optimal performance of your new GFA-5802 will ultimately depend on the care with which you make the
connections between the amplifier, preamplifier and the loudspeakers All input and output signal connections should be made
only with high quality, low-loss, low capacitance cables following the recommendations in the following relevant sections.