User manual MCINTOSH MC2301 VACUUM TUBE MONOBLOCK POWER AMPLIFIER

[. . . ] Tube Power Amplifier MC2301 Owner's Manual McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549 The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. WARNING - TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. To prevent the risk of electric shock, do not remove cover or back. No user-serviceable parts inside. IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. 1. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. [. . . ] A custom cabinet instal- MC2301 Side View in Custom Cabinet lation should provide the following minimum Chassis Spacers spacing dimensions for cool operation. Cutout Opening for Ventilation Allow at least 12 inches (30. 48cm) above the top, Support 2" Shelf 2 inches (5. 08cm) below 5. 08cm the bottom and 4 inches (10. 16cm) on each side of the Power Ampli17-1/2" fier, so that airflow is 44. 45cm 2-1/32" not obstructed. Allow MC2301 Bottom View 1. 67cm 15-5/16" 14" in Custom Cabinet 22 inches (55. 88cm) 38. 91cm Cutout Opening 35. 56cm for Ventilation depth behind the front panel. inch (4. 12cm) in front For purposes of clarity, the above illustration is not drawn to scale. of the mounting panel1 9 Notes 10 Rear Panel Connections and Switch Connect the MC2301 power cord to a live AC outlet. Refer to the rear panel to determine the correct voltage POWER CONTROL IN receives a turn On/Off signal from a McIntosh component and the POWER CONTROL OUT sends a turn On/Off signal to the next McIntosh Component BALANCED INput1 / OUTput for an audio cable from a Preamplifier output or to connect an audio cable on to the next Power Amplifier input Main Fuse holder, refer to information on the back panel of your MC2301 to determine the correct fuse size and rating INPUT MODE switch selects between balanced or unbalanced input OUTPUT Connections for 2 ohm Loudspeaker OUTPUT Connections for 4 ohm Loudspeaker OUTPUT Connections for 8 ohm Loudspeaker Caution: The Loudspeaker Negative Connections are above chassis ground. Do not combine any connections together, ground them or connect with another MC2301 or other Power Amplifier. UNBALANCED INPUT for an audio cable from a Preamplifier or A/V Control Center audio output BALANCED INPUT for an audio cable from a Preamplifier or A/V Control Center audio output 1 This Balanced connector may be used as an Input ONLY when connected to a McIntosh C1000 Preamplifier. For all other connections use only as an Output. 11 How to Connect Caution: The supplied AC Power Cord should not be connected to the Rear Panel of the MC2301 Tube Power Amplifier until after the Loudspeaker Connections have been made. For additional instruction on making Loudspeaker Connections contact your McIntosh Dealer or McIntosh Technical Support. For Remote Power Control, connect a power control cable from the Control Center or Preamplifier Power Control Out to the MC2301 POWER CONTROL IN. Connect a cable from the Balanced Output of a McIntosh Preamplifier or Control Center to the MC2301 BALANCED INPUT. Spade lug or prepared wire connection: Insert the spade lug connector or prepared section of the cable end into the terminal side access hole, and tighten the terminal cap until the cable is firmly clamped into the terminal so the wires cannot slip out. Banana plug connection: Insert the banana plug into the hole at the top of the terminal. Refer to figures A and B. Note: Banana Plugs are for use in the United States and Canada only. When connecting Loudspeakers to the MC2301 it is very important to use cables of adequate size, so there is little to no power loss in the cables. The smaller the Gauge number, the larger the wire size: Loudspeaker Cable Distance vs Wire Gauge Guide Loudspeaker Impedance 2 Ohms 4 Ohms 8 Ohms 25 feet (7. 62 meters) or less 50 feet (15. 24 meters) or less 100 feet (30. 48 meters) or less Note: An optional hookup is to use an unbalanced cable and place the INPUT MODE Switch in the UNBALANCED Position. 12AWG 14AWG 16AWG 10AWG 12AWG 14AWG 8AWG 10AWG 12AWG 3. This McIntosh MC2301 Tube Power Amplifier is designed for the connection of a single Loudspeaker with an impedance of 2 ohms, 4 ohms or 8 ohms. Note: The remaining Loudspeaker Terminals on the Amplifier should not be connected to another Loudspeaker. When making Loudspeaker Connections to the MC2301 refer to the Connection Diagram on the next page. This is an example of a typical audio system, your system may vary from this, however the actual Loudspeaker would be connected in a similar manner. Connect the Loudspeaker hookup cables from a single Loudspeaker to the output terminals that match the impedance of the Loudspeaker, being careful to observe the correct polarities. Output impedance connections of 2 ohms, 4 ohms and 8 ohms are provided. If the Loudspeaker's impedance is in-between the available connections, use the nearest lower impedance connection. Connect the MC2301 Power Cord to a live AC outlet. WARNING: Loudspeaker terminals are hazardous live and present a risk of electric shock. 4. Prepare the Loudspeaker Hookup Cables that attach to the Amplifier by choosing one of the methods below: Bare wire cable ends: Carefully remove sufficient insulation from the cable ends, refer to figures 1, 2 & 3. [. . . ] When the pointer reaches its peak it pauses only long enough for the human eye to perceive its position, Figure 15 then drops. A front panel switch is provided to change the meter to the Watts Hold Mode of operation. This allows fast upward movement of the pointer but greatly increases Hold Time at the peak of its travel. Sentry Monitor Protection Circuit The MC2301 incorporates the newly designed Sentry Monitor Tube Protection Circuitry. [. . . ]