Adcom GFP-345 - Manual (Page 3)

• Low-output-impedance {100 ohms) from both sets of outputs to reduce interaction of connecting cables and other
equipment and preserve music dynamic contrasts.
• Five sets of inputs, front panel controlled, including TAPE IN; six sets if the EXTERNAL PROCESSOR IN jacks are
used also as an auxiliary input.
• Low-impedance tape outputs (100 ohms) to perfectly interface with any type of tape recorder. This technique allows
the preamp to mate with any type recorder, including DAT and DCC, and insures the best recording characteristics
independently of the cable used and the toad impedance of the tape recorder inputs.
• Buffered tape outputs to preserve input-source-signal integrity and preclude "loading" of the signal-source
components and distortion. Buffering prevents the degradation of the source signal caused by most tape recorders
when they are connected to the tape outputs. The buffers insure that the integrity of the internal signal path will not
be affected by the tape recorder used.
• Front-panel-switchable processor loop. Shortens the signal path by switching the processor in and out of the circuit
directly on the main circuit board. Allows the processor to be removed totally from the circuit when not needed.
• All high-grade construction parts including 1%, Roederstein metal-film resistors and all metallized-film, precision
capacitors throughout. These components helps the GFP-345 achieve lower noise levels and lower signal
degradation than preamps selling for many times its price.
• Extremely-low-noise, optional phono preamplifier board (PHO-802A) with virtually zero RIAA error, optimized for
high-output moving-coil and moving-magnet cartridges plus direct-coupled signal output for maximum bass
impact and dynamic response. These features will provide the flattest, lowest-noise, lowest-distortion response
from a phono cartridge and musically satisfying reproduction from any vinyl record.
• Low-impedance, RIAA-equalization network. This unique network insures the lowest achievable noise level in a
phono preamp.
UNPACKING THE GFP-345
Before each GFP-345 left the factory, it was carefully inspected for physical imperfections and electrical performance as
a routine part of AOCOM’s systematic Quality Control. This, along with full operational and mechanical testing, should
insure a product flawless in both appearance and performance. After you have unpacked the GFP-345, inspect it for
physical damage. Save the shipping carton and all packing materials as they are intended to reduce to a minimum the
possibility of transportation damage, should the product ever need to be shipped again. In the unlikely ëyent damage has
occurred, notify your dealer immediately and request the name of the carrier so that a written claim to cover shipping
damage 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.
INSTALLING THE GFP-345
Although the GFP-345 does not generate much heat, you will help insure its long-term, trouble-free operation if you keep
it away from external sources of heat, such as radiators or hot-air ducts, and provide reasonable ventilation. The GFP-345
should never be placed with other heat-producing components in a cabinet or enclosure lacking free air flow. If placed
near or above any heat-producing component, such as a power amplifier, please allow a minimum of three inches between
the components.
For use in professional installations, the GFP-345 may be mounted in a standard 19-inch rack using the optional RM-3
rack-mount adaptors available through ACCOM dealers.
CONNECTING THE GFP-345
The performance of the GFP-345 will depend on the quality of the interconnection of both the preamplifier and its
associated equipment. All the input- and output-signal connections should be made only with high-quality, low-loss
audio cables. LEFT CHANNEL and RIGHT CHANNEL inputs and outputs are cleaHy labelled on the rear panel.