User manual MCINTOSH C2200

[. . . ] Owner's Manual C2200 Tube Preamplifier C2200 McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549 IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. 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. [. . . ] This could result in the constant need to readjust the C2200 Volume Control when switching between different Input Sources. A Volume Trim Feature on the C2200 allows the adjustment of levels for each of the Source Inputs, so that they have the same relative volume. The Tuner and CD Inputs are used in the following example. Notes: The possible range of adjustment in volume level is ± 6dB. The Tape/Record Output Levels are uneffected by any changes in the Trim Settings. Any TRIM adjustments made are retained in permanent memory and can be changed only by performing a new TRIM procedure. The Tuner Input Volume Level can serve as a reference or choose another Input Source that is frequently listened to as the reference. The reference Input Source should be set to a Trim Level of 00. 7. Rotate the INPUT Control until the next desired Input Source Name is displayed. Repeat steps 5, 6 and 7 until all the Inputs with sources connected to the C2200 have the same relative volume levels when switching between them. Press the SETUP Push-button to exit the Setup Mode. Note: The Trim Level can also be set via the Remote Control. A table has been provided on page 17 to record the changes to the various inputs from the default settings. Re-Title Inputs The C2200 has eight Audio Inputs. These inputs already have assigned titles that will allow for immediate hookup, operation and enjoyment. If these starting assignments do not match up with components in your system, they may be reassigned from the default settings. The following example will illustrate how to rename the AUX Input to PHONO. When the Input Selector is rotated to select what was originally the AUX Input, PHONO will now appear on the Front Panel Alphanumeric Display and Power is now supplied to the Vacuum Tubes in Phono Circuitry. Notes: 1. Unused Inputs may be switched Off so they will not appear when rotating through the input source choices using the Input Selector and also will not be available when using the Remote Control or Keypad. The New Input Titles that are available for all the Inputs (except for the AUX Input) includes TAPE 2, LV, TV, and VCR2. The AUX Input Titles include TAPE 2, LV, TV and PHONO. 1. Rotate the INPUT Control to select the Tuner Input and adjust the VOLUME Control to the desired listening level. Press the SETUP Push-button to access the Setup Mode. The Front Panel Alphanumeric Display will change and the Red LED above the SETUP Push-button will be illuminated. Rotate the METER LIGHTS (Menu) Control until the words TRIM 00 TUN appears. [. . . ] After a great deal of research we found that mechanical potentiometers cannot approach the tracking accuracy that McIntosh felt was necessary. Therefore, we choose to use a dual attenuator with switching driven from a 16-bit serial data word. Resistor values are decoded by an internal multiplexer to steps of 0. 5dB. Step error and channel matching is less than . 1dB. [. . . ]