User manual MCINTOSH MC2000

[. . . ] MC2000 Tube Power Amplifier New Millennium Edition 50th Anniversary 1949 - 1999 MC2000 OWNERS MANUAL A Brief History of McIntosh Frank H. Gow For Fifty Years 1999 is the 50th year of business for McIntosh Laboratory of Binghamton, New York. McIntosh organized a small electronic engineering consulting firm in the Washington, DC area. One of the many goals his firm addressed was the need for a high quality audio power amplifier. [. . . ] Carefully insert the tube into the socket until the base of the tube is fully seated in the tube socket. Repeat the above steps for the remaining 5 Small Signal Tubes, refer to figure 5. 8 Installation, cont After all the tubes have been inserted into the correct sockets, the tube cover must to be installed before operating the MC2000. Locate the tube cover and the two long fastening screws and perform the following steps: Installing the Tube Cover: 1. Orient the MC2000 so the Front Panel is facing you. 5. Carefully place the Tube Cover onto the MC2000 while at the same time aligning the screws with the openings on the MC2000 Chassis, refer to figure 6. Using the supplied screwdriver secure the tube cover to the chassis, do not over tighten the screws. Location and ventilation Adequate ventilation extends the trouble free life of any electronic instrument. The suggested minimum space for mounting the MC2000 is 20 inches (50. 8cm) in width, 22 inches (55. 9cm) depth, and 17 inches (43. 18cm) in height. Always allow air to flow through the ventilation holes on the botFigure 7 tom of the amplifier and a means for the warm air to escape at the top. If all the components are installed in a single cabinet, one or more quiet running ventilation fans can be a definite help in maintaining all the system components at their coolest possible operating temperatures. Refer to figure 7. Warm Air Tube Cover Fastening Screw Locations Tube Cover Wide Side Opening Figure 6 Cool Air 2. Remove the two shipping screws from the MC2000 Chassis with the supplied screwdriver, refer to figure 5. The Tube Cover has a wide opening along one side of its longer dimension. Orient this wide opening so that it is facing towards you. Insert the supplied long screws into each top side of the tube cover so they extend below the bottom edge. 9 MC2000 Rear Panel Connections POWER CONTROL IN and OUT receives a turn-on signal and sends it to another McIntosh Component INPUT SWITCH selects the desired amplifier sensitivity setting for both the Left and Right Channels MODE SWITCH selects Balanced or Unbalanced Inputs for both the Left and Right Channels LEFT BALANCED INPUT for audio cables from a Preamplifier or Control Center Audio Outputs RIGHT CHANNEL BALANCED INPUT for audio cables from a Preamplifier or Control Center Audio Outputs RIGHT UNBALANCED INPUT for audio cables from a Preamplifier or Control Center Audio Outputs LEFT UNBALANCED INPUT for audio cables from a Preamplifier or Control Center Audio Outputs RIGHT OUTPUT connections for 2, 4 or 8 ohm loudspeakers FUSE 2 HOLDER for the Right Channel, refer to information on the top rear panel of your MC2000 to determine the correct fuse size and rating Connect the MC2000 power cord to an active AC outlet. Refer to information on the back panel to determine the correct voltage FUSE 1 HOLDER for the Left Channel, refer to information on the top rear panel of your MC2000 to determine the correct fuse size and rating LEFT OUTPUT connections for 2, 4 or 8 ohm loudspeakers 10 How to Connect the MC2000 How to Connect the MC2000 1. For Remote Power Control, connect a power control cable from the Control Center or Preamplifier Power Control Out to the MC2000 Power Control In. Note: The Power Control Connecting Cable is available from the McIntosh Parts Department: Data and Power Control Cable Part No. 170202; six foot, shielded 2 conductor, with 1/8 inch stereo mini phone plugs on each end. McIntosh C100 Controller 2. Connect the MC2000 power cord to an active AC outlet. Note: Make sure that the MC2000 Front Panel Power Control is in the OFF position. To AC Outlet 11 How to Connect the MC2000, cont 3. Connect cables from the balanced outputs of a McIntosh Preamplifier or Control Center to the MC2000 Balanced Inputs. 4. Connect the loudspeaker hookup cables to the output terminals, which will accept bare cable ends, spade lugs, or banana plugs. Attach cables to the terminals that match the impedance of your loudspeakers, being careful to observe the correct polarities. [. . . ] A red LED on the front panel lights to indicate that the REMOTE position has been selected, and the amplifier is in the standby mode. Technical Description, cont Block Diagram of the Power Supply Section 8=ADB7 5DB4 2DAA4=C ;8<8C4A 8=?DC ?>F4A E>;C064 CA0=B5>A<4A B4;42C>A !E02 ;45C !E !E <08=$E 32BD??;H 32 32 ?>F4A $0=3 BD??;H "E32 !E02 !!"E02 $%7i ?>F4A A4;0H !E !E <08=$E 32BD??;H 32 8=ADB7 5DB4 2DAA4=C ;8<8C4A 8=?DC ?>F4A E>;C064 CA0=B5>A<4A B4;42C>A 32 A867C $0=3 ?>F4A BD??;H "E32 8= BC0=31H 5DB4 CA0=B5>A<4A $EBD??;H BF8C27 2>=CA>; >DC 902:B 2>=CA>; ?>F4A ?>F4A A4<>C4 A4<>C4 ;0<? Figure 21 19 0. 5 0. 4 Total Harmonic Distortion vs. Frequency @ 8 Ohms THD % 0. 3 0. 2 0. 1 20 50 100 200 500 1k 2k 5k 10k 20k Hz (Hertz) Frequency Response @ 1 Watt +0 -5 (Decibel) dB -10 -15 -20 -25 10 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k Hz (Hertz) (Decibel) dB +0 -100 20 50 Signal to Noise Ratio FFT Spectrum Analysis ref. full power 100 200 500 1k 2k 5k 10k 20k Hz (Hertz) Note: These Performance Charts are examples of typical performance of the MC2000. 20 Performance Charts 4 3 Total Harmonic Distortion vs. [. . . ]