McIntosh WX1001 Service Manual
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McIntosh WX1001 Service Manual

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Performance Specifications ........................................ 2
Notes ......................................................................... 2
Rear Panel .................................................................. 3
Section Location ........................................................ 3
Block Diagram ...................................................... 5 - 6
Interconnection Diagram ...................................... 7 - 8
Main Schematic and PCB ................................... 9 - 18
SERVICE MANUAL
C220
TUBE PREAMPLIFIER
SERIAL NO. WX1001 And Above
CONTENTS
Display Schematic and PCB .............................. 19 - 24
Balanced/Data Sch and PCB .............................. 25 - 30
Pushbutton Sch and PCB .................................. 31 - 32
Headphone Sch and PCB ................................. 33 - 34
Parts List ............................................................ 37 - 43
Repacking Instructions ............................................. 45
C220

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  • Page 1: Table Of Contents

    C220 C220 TUBE PREAMPLIFIER SERIAL NO. WX1001 And Above CONTENTS Performance Specifications ........2 Display Schematic and PCB ......19 - 24 Notes ................. 2 Balanced/Data Sch and PCB ......25 - 30 Rear Panel ..............3 Pushbutton Sch and PCB ........31 - 32 Section Location ............

  • Page 2: Performance Specifications

    PERFORMANCE SPECIFICATIONS Frequency Response Headphone Output Impedance +0, -0.5dB from 20Hz to 20,000Hz 16 ohms to 250 ohms Total Harmonic Distortion Tube Compliment 0.08% from 20Hz to 20,000Hz Phono Circuitry: 2 - 12AX7A High Level Circuitry: 2 - 12AX7A Main Output 2.5V for rated input Power Requirements 100 Volts, 50/60Hz at 75 watts...

  • Page 3: Rear Panel

    C220 REAR PANEL SECTION LOCATIONS TOP VIEW WITH COVER REMOVED...
  • Page 4 NOTES...

  • Page 5: Block Diagram

    C220 BLOCK DIAGRAM...
  • Page 6 INTERCONNECT...
  • Page 7 C220 MAIN 750674 SCH 1 OF 4...
  • Page 8 MAIN 750674 SCH 2 OF 4...
  • Page 9 C220 MAIN 750674 SCH 3 OF 4...
  • Page 10 MAIN 750674 SCH 4 OF 4...
  • Page 11 C220 MAIN 750674 PCB...
  • Page 12 DISPLAY 750330 SCH 1 of 3...
  • Page 13 C220 DISPLAY 750330 SCH 2 of 3...
  • Page 14 DISPLAY 750330 SCH 3 of 3 and PCB...
  • Page 15 C220 BALANCED / DATA 750331 SCH 1 of 2...
  • Page 16 BALANCED / DATA 750331 SCH 2 of 2...
  • Page 17 C220 BALANCED / DATA 750331 PCB...
  • Page 18 PUSHBUTTON 750333 SCH and PCB...
  • Page 19 C220 HEADPHONE 750332 SCH and PCB...
  • Page 20 NOTES...

  • Page 21: Parts List

    C220 PARTS LIST MAIN PCB 750329 Ref No. Description Part No. Ref No. Description Part No. CAP ELECT 10UF 50V 066445 CAP MONO 47PF 200V 10% NPO 061340 CAP MPF 0.1UF 630VDC 064431 CAP POLYPROP 1UF 20% 250VDC 064433 CAP MONO 47PF 200V 10% NPO 061340 CAP ELECT 1UF 50V 066510...
  • Page 22 PARTS LIST con’t MAIN PCB 750329 (cont’d) Ref No. Description Part No. Ref No. Description Part No. C126 CAP MONO .1UF 50V 20% Z5U 061346 JACK PHONO 8P GOLD PLATED 117455 C127 CAP ELECT 10UF 50V 066445 CONN 18 PIN FFC 117908 C128 CAP ELECT 10UF 50V...
  • Page 23 C220 PARTS LIST con’t MAIN PCB 750329 (cont’d) Ref No. Description Part No. Ref No. Description Part No. TRANSISTOR N JFET 132318 RES MF 1.5K 1% 1/4W 144539 TRANSISTOR N JFET 132318 RES MF 267K 1% 1/4W 144532 TRANSISTOR N JFET 132318 RES MF 12.1K 1% 1/4W 144550...
  • Page 24 PARTS LIST con’t MAIN PCB 750329 (cont’d) Ref No. Description Part No. Ref No. Description Part No. RES NETWORK 2 X 220K ISO 144678 R143 RES MF 100K 1% 1/4W 144528 RES MF 1M 1% 1/4W 144577 R144 RES MF 33.2K 1% 1/4W 144694 RES MF 47.5K 1% 1/4W 144526...
  • Page 25 IC DUAL OPERATIONAL AMPLIFIER 133578 RELAY REED SPST-NO 5V 1.2A 087078 IC DUAL OPERATIONAL AMPLIFIER 133578 RELAY REED SPST-NO 5V 1.2A 087078 TUBE 12AX7A MCINTOSH 165065 MTGPA1 DBL COATED MTG-TAPE 1/16” THK 094409 (V1) SOCKET 9 PIN TUBE CERAMIC 178170 MTGPA2 DBL COATED MTG-TAPE 1/16”...
  • Page 26 PARTS LIST con’t DISPLAY PCB 750330 (cont’d) Ref No. Description Part No. Ref No. Description Part No. CAP MONO 1000PF 50V 10% NPO 061344 RES MF 100 OHM 1% 1/4W 144568 CAP MONO .1UF 50V 20% Z5U 061346 RES MF 100 OHM 1% 1/4W 144568 DIODE SILICON 070174...
  • Page 27 C220 PARTS LIST con’t BALANCED/DATA PCB 750331 (cont’d) PUSHBUTTON PCB 750333 Ref No. Description Part No. Ref No. Description Part No. RES MF 182 OHM 1% 1/4W 144579 LED SQUARE RED 058109 RES MF 182 OHM 1% 1/4W 144579 (DS1) LED SPACER .220 LENGTH 163001 RES MF 182 OHM 1% 1/4W...
  • Page 28 NOTES...

  • Page 29: Repacking Instructions

    C220 REPACKING INSTRUCTIONS...

  • Page 30: Tube Preamplifier

    SERIAL NO. WX1001 And Above The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated, who reserve the right to improve design without notice. Because of the constant upgrading of McIntosh products’ circuitry and components, the Company cannot insure, and does not warrant, the accuracy of the within schematic material, which is intended for information only.

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