McIntosh MR65 Tuner Schematic Diagram.pdf
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McIntosh MR65 Tuner Schematic Diagram.pdf
MODEL NUMBER: MR 65B, MX 110, MR 67 DATE: MARCH 1965 MODIFICATION: To allow adjust control for instant correction of tube and circuit variations. This will insure proper MPX indicator light operation. PROCEDURE: This modification will allow you to adjust the MPX light on all tuners with ease. The reason for this modification is to allow simple field adjustment of varying tube and circuit characteristic. MR 65B and MX 110 tuner/preamp. 1. Install IK control (WC 807) to MPX chassis. Use the existing MPX chassis mount ing screw. 2. Remove the 820 ohm or IK ohm resistor, (cathode circuit of 6U8) 3. Solder one end of 470 ohm resistor to bottom hole nearest the chassis. 4. Connect a lead from other end of the resistor to the terminal lug on a 1K control. 1. Install IK control to the tuner chassis under the existing screw as shown in the diagram. 2. Follow steps 2, 3, 4, as above. TO ADJUST THE CONTROL: Tune to point of no station. Place mute to IN position. Turn control from full clockwise position to a point where the light just goes out. MR 65B, MX 110, MR 67
