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Фрагмент инструкции
The MOSFET will even withstand a dead shorted output resulting in very high drain current without any protection circuitry for a very short time. MOSFETS also do not have a “storage time” associated with them (a phenomenon found in bipolar transistors in which a certain amount of time is required to turn the transistor off). Therefore the MOSFET is said to be a “fast” device which can function very accurately with high amplitude/high frequency signals and transient waveforms. The unmatched reliability of the power MOSFET output devices and the integrity of the rugged mechanical design of the FTX series amplifiers ensure years of maintenance-free service. UNPACKING As a part of our system of quality control, every Ashly product is carefully inspected before leaving the factory to ensure flawless appearance. After unpacking, please inspect for any physical damage. Save the shipping carton and all packing materials, as they were carefully designed to reduce to minimum the possibility of transportation damage should the unit again require packing and shipping. In the event that damage has occurred, immediately notify your dealer so that a written claim to cover the damages can be initiated. The right to any claim against a public carrier can be forfeited if the carrier is not notified promptly 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. POWER Connect the FTX series amplifier to a standard 3-wire grounded electrical outlet supplying 120 volts, 50-60 Hz (some export models are wired for 240 volts). The power consumption is given in the specifications section, STANDARD CONNECTIONS AND CONTROLS The rear panel of a FTX-2O0Q amplifier with the standard input panel is shown in figure 1. For descriptions of other input options available, see the section on input options. Ashly FTX/CFT Owners Manual Page 2 16.3’ DIMENSIONS 1 7.0” ........ 1.5" FTX/P70 Series Amplifiers IT l_- 19.0" ----— FTX1000, FIX 1500, P70-400 Amplifiers 18.375“ 3.0” 3.5'' FTX2000, P70-800 Amplifiers 2.25" 5.22" e Ashly FTX/CFT Owners Manual Page 11 16.0' DESIGN THEORY Ashly FTX series amplifier circuits are totally discrete using high-voltage, wide bandwidth electronics. The input section is a complimentary Darlington differential amplifier stage for high common-mode rejection, low noise and low distortion. All voltage gain stages in the amplifier operate class A for low distortion. The quasi-complimentary MOSFET output stage has almost infinite current gain, therefore the output driver stages are nearly lossless. All circuitry within the feedback loop is discrete which allows the amplifier to recover instantly and cleanly without any spikes or glitches from a clipped condition. This overall design approach inherently assures low noise, low distortion, and excellent transient and overload response. Inputs are bridging and active balanced, and all input connections can operate as balanced or unbalanced. Tum-on delay relays are not needed because of the symmetry of the totally discrete complementary electronics. The MOSFET output devices do not require short-circuit protection and V.L limiting circuitry, thus enabling a simpler, more reliable electronic design. Rear panel accessible speaker fuses are provided to protect the amplifier from prolonged output shorts. These fuses are wired within the feedback loop of the amplifiers to ensure that they do not alter the audio fidelity. All electronic components are mounted to rugged glass-epoxy circuit boards. Large computer-grade electrolytic capacitors assure long service. The FTX series amplifiers are packaged in a rugged 16-gauge steel chasses. The power transformer is located at the front center of the chassis to minimize front panel torsion. Each channel’s electronics and heat sink are identical yet completely independent and modular, each with a single plug-in connector for ease of servicing. Large custom black-anodized extruded aluminum heat sinks with fan cooling provide plenty of thermal headroom. The CFT-1800 utilizes quiet convection cooling for studio control rooms, home hi-fi, and other applications where low ambient noise is essential. Like the FTX series, the CFT-1800 is a modular design for ease of servicing. Because of the passive cooling in the CFT-1800, thermal headroom is somewhat reduced from that of forced air cooling, thus making it inadvisable to drive 4 ohm loads at continuous high power with this amplifier. It is also important to allow for free air circulation above the amplifier to achieve optimum cooling action. Ashly FTX/CFT Owners Manual Page 10 Figure I: FTX-20Ö0 Rear Panel. With Standard Input 1. INPUTS The standard input panel of the FTX series amps is equipped with balanced 1/4" tip-ring-sleeve (TRS) phone jacks, balanced XLR jacks, and balanced screw-terminal inputs. The three types of connectors are internally wired i...
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