McIntosh C500 Service Manual
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McIntosh C500 Service Manual

McIntosh C500 Service Manual

Tube preamplifier
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Performance Specifications ..........................................2
Notes ...........................................................................2
Rear Panel ...................................................................3
Section Location ..........................................................3
Block Diagram ............................................................4
Interconnection Diagram ........................................5 - 6
Main Left Schematic and PCB .............................. 7 - 18
Main Right Schematic and PCB ..........................19 - 30
Phono.................................................................31 - 32
C500
TUBE PREAMPLIFIER
SERIAL NO.AAB1001 And Above
CONTENTS
SERVICE MANUAL
Serial Number YT1001 And Above
Balanced I/O Left Schematic and PCB ................33 - 34
Balanced I/O Right Schematic and PCB ..............35 - 36
Balanced Switching Left Schematic and PCB ......37 - 38
Balanced Switching Right Schematic and PCB ....39 - 40
Meter Schematic and PCB ..................................41 - 42
Headphone Schematic and PCB .........................43 - 44
Parts List .............................................................45 - 55
Repacking Instructions ...............................................57
C500
TUBE PREAMPLIFIER

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  • Page 1: Table Of Contents

    C500 C500 TUBE PREAMPLIFIER TUBE PREAMPLIFIER SERIAL NO.AAB1001 And Above CONTENTS Performance Specifications ..........2 Balanced I/O Left Schematic and PCB ....33 - 34 Notes ................2 Balanced I/O Right Schematic and PCB ....35 - 36 Rear Panel ..............3 Balanced Switching Left Schematic and PCB ..37 - 38 Section Location ............3...

  • Page 2: Performance Specifications

    Phono: MM, 47K ohms; 50 to 750pF, in 50pF steps C500 Preamplifier and C500 Tube Preamplifier. They are MC: 25, 50, 100, 200, 500 or 1,000 ohms; 100pF the ONLY cables to be used for connecting a C500 Control- ler to the C500 Preamplifier or C500 Tube Preamplifier. Maximum Input Signal High Level: 5V Unbalanced...

  • Page 3: Rear Panel

    C500 TUBE PREAMPLIFIER REAR PANEL SECTION LOCATIONS TOP VIEW WITH COVER REMOVED...

  • Page 4: Block Diagram

    BLOCK DIAGRAM...
  • Page 5 C500 TUBE PREAMPLIFIER INTERCONNECT...
  • Page 6 MAIN LEFT 751053 SCH 1 OF 5 MM IN J18:1 J4:1 J18:2 J4:2 J15:1 J2:12 J1:1 J15:2 J2:11 J17:1 J1:12 J15:3 J2:10 J17:2 J1:11 J15:4 J17:3 J2:9 J1:10 J15:5 J2:8 J15:6 J2:7 -24V FIL GND J15:7 J17:11 J2:6 J1:2 FIL GND J15:8 J2:5 J17:9...
  • Page 7 C500 TUBE PREAMPLIFIER MAIN LEFT 751053 SCH 2 OF 5...
  • Page 8 MAIN LEFT 751053 SCH 3 OF 5 LISTEN+ J12:12 J2:1 LISTEN- J12:11 J2:2 LISTEN PROCESSOR 2.21 J12:10 BALANCED TO UNBALANCED J2:3 5.6V 22pF J12:9 INPUT J2:4 BUFFER 2.21 22pF 10uF J12:8 J2:5 -15V J12:7 J2:1 J2:6 -18V 10uF J5:1 CDR LIS DVD(1) DVD_IN 10uF...
  • Page 9 C500 TUBE PREAMPLIFIER MAIN LEFT 751053 SCH 4 OF 5 5.6V TUBE_ON R137 33.2k R120 100k 300V 170V U25+ R140 170V 300V C125 2.21 22pF + VOLUME CONTROL U28+ R190 C114 C122 C145 BUFFER 2.21 U19+ R109 22pF .22uF .047uF 2.21...
  • Page 10 MAIN LEFT 751053 SCH 5 OF 5 R201 C168 2.21 22pF R213 J13:2 R HDPH J13:1 C159 22pF 5.6V R212 6.49k .5% L_+VOL R204 6.49k .5% R202 LISTEN PROCESSOR L_-VOL 2.21 BALANCED TO UNBALANCED -18V BUFFER 100pF R199 PWR_ON_ATTN 2.21 C155 R214 22pF...
  • Page 11 C500 TUBE PREAMPLIFIER 2 MAIN LEFT 751053 PCB...
  • Page 12 MAIN RIGHT 751054 SCH 1 OF 5 MM IN J19:1 J4:1 J19:2 J4:2 MM OUT J15:1 J2:12 J1:1 J15:2 MM IN J2:11 J17:1 J1:12 J15:3 J2:10 J17:2 J1:11 J15:4 J17:3 J2:9 J1:10 -24V J15:5 J2:8 -24V J15:6 -24V J2:7 FIL GND J15:7 J17:11 J2:6...
  • Page 13 C500 TUBE PREAMPLIFIER MAIN RIGHT 751054 SCH 2 OF 5 5.6V J8:12 J1:1 5.6V J4:1 10uF RECORD J8:11 J1:2 RECORD DECODER J8:10 PROCESSOR SDATA J1:3 J4:2 10uF DATA SCLK J8:9 FROM J1:4 RESET 5.6V RECPROC 1000pF RECORD OUT J8:8 DVD_LIS...
  • Page 14 MAIN RIGHT 751054 SCH 3 OF 5 J12:12 LISTEN+ J2:1 J12:11 LISTEN- J2:2 LISTEN PROCESSOR 2.21 J12:10 BALANCED TO UNBALANCED J2:3 5.6V 22pF J12:9 INPUT J2:4 2.21 BUFFER 10uF 22pF J12:8 J2:5 J12:7 -15V J2:6 J2:1 -18V 10uF J5:1 DVD(1) DVD_IN 10uF CDR LIS...
  • Page 15 C500 TUBE PREAMPLIFIER MAIN RIGHT 751054 SCH 4 OF 5 5.6V TUBE_ON R137 33.2k R120 100k 300V 170V U25+ R140 170V 300V C125 2.21 22pF U28+ R190 + VOLUME CONTROL C114 C145 BUFFER C122 2.21 U19+ R109 .22uF 22pF .047uF 2.21...
  • Page 16 MAIN RIGHT 751054 SCH 5 OF 5 R201 C168 2.21 22pF R213 J13:2 R HDPH J13:1 RING C159 22pF 5.6V R212 6.49k .5% R_+VOL R204 6.49k .5% R202 R_-VOL 2.21 LISTEN PROCESSOR -18V BALANCED TO UNBALANCED 100pF BUFFER PWR_ON_ATTN R199 2.21 R214 C155...
  • Page 17 C500 TUBE PREAMPLIFIER 3 MAIN RIGHT 751054 PCB...

  • Page 18: Phono

    4 PHONO 750110 SCH and PCB...
  • Page 19 C500 TUBE PREAMPLIFIER 5 BALANCED I/O LEFT 750736 SCH and PCB...
  • Page 20 6 BALANCED I/O RIGHT 750737 SCH and PCB...
  • Page 21 C500 TUBE PREAMPLIFIER 7 BALANCED SWITCHING LEFT 750108 SCH and PCB...
  • Page 22 8 BALANCED SWITCHING RIGHT 750155 SCH and PCB...
  • Page 23 9 METER 750106 SCH and PCB METER ADJUSTMENT PROCEDURE Apply a 1kHz signal to both channels. Adjust the level for 2.5VAC at L and R SPKR1 unbal- anced output. Adjust R13 for 0dB on the C500 left and right meters...
  • Page 24 10 HEADPHONE 750262 SCH and PCB...

  • Page 25: Parts List

    C500 TUBE PREAMPLIFIER PARTS LIST Ref. No. Description Part No. CAP MONO 100PF 100V 10% NPO 061341 INTERCONNECT CAP ELECT 10UF 100VDC 066462 Ref. No. Description Part No. CAP MONO .1UF 50V 20% Z5U 061346 METER 124097 CAP MONO .1UF 50V 20% Z5U...
  • Page 26 PARTS LIST Cont’d Ref. No. Description Part No. RELAY REED FORM 1A 5V 500 OHMS 087050 MAIN LEFT PCB 751053 (Cont’d) RELAY REED FORM 1A 5V 500 OHMS 087050 Ref. No. Description Part No. RELAY REED FORM 1A 5V 500 OHMS 087050 C159 CAP MONO 22PF 200V 10% NPO...
  • Page 27 C500 TUBE PREAMPLIFIER PARTS LIST Cont’d Ref. No. Description Part No. R128 RES MF 221K 1% 1/4W 144629 MAIN LEFT PCB 751053 (Cont’d) R129 RES MF 2.21M 1% 1/4W 144576 Ref. No. Description Part No. R130 RES MF 2.21M 1% 1/4W 144576 RES MF 47.5K 1% 1/4W...
  • Page 28 PARTS LIST Cont’d Ref. No. Description Part No. CAP ELECT 10UF 16V 066580 MAIN LEFT PCB 751053 (Cont’d) CAP ELECT 10UF 16V 066580 Ref. No. Description Part No. CAP ELECT 10UF 16V 066580 R210 RES MF 33.2K 1% 1/4W 144694 CAP ELECT 10UF 16V 066580 R211...
  • Page 29 C500 TUBE PREAMPLIFIER PARTS LIST Cont’d Ref. No. Description Part No. LED GREEN 3MM HI INTENSITY 058197 MAIN RIGHT PCB 751054 (Cont’d) BRACKET PCB CARD MOUNTING 003611 Ref. No. Description Part No. BRACKET PCB CARD MOUNTING 003611 C103 CAP MONO .1UF 50V 20% Z5U...
  • Page 30 PARTS LIST Cont’d Ref. No. Description Part No. RES MF 10 OHM 1% 1/4W 144553 MAIN RIGHT PCB 751054 (Cont’d) RES MF 10 OHM 1% 1/4W 144553 Ref. No. Description Part No. RES MF 47.5K 1% 1/4W 144526 TRANSISTOR NPN SILICON 132317 RES MF 47.5K 1% 1/4W 144526...
  • Page 31 C500 TUBE PREAMPLIFIER PARTS LIST Cont’d Ref. No. Description Part No. IC SHFT REG SER-PAR 133594 MAIN RIGHT PCB 751054 (Cont’d) (U8) SOCKET IC DIP 16 PIN DUAL 178182 Ref. No. Description Part No. IC SHFT REG SER-PAR 133594 R144...
  • Page 32 PARTS LIST Cont’d Ref. No. Description Part No. RES MF 100 OHM 1% 1/4W 144568 PHONO PCB 750110 (Cont’d) RES MF 2.74K 1% 1/4W 144587 Ref. No. Description Part No. RES MF 2.74K 1% 1/4W 144587 CAP MONO .1UF 50V 20% Z5U 061346 IC OPERATIONAL AMP LOW NOISE 133565...
  • Page 33 C500 TUBE PREAMPLIFIER PARTS LIST Cont’d Ref. No. Description Part No. RES MF 267K 1% 1/4W 144532 BALANCE I/O LEFT PCB 750736 (Cont’d) RES MF 267K 1% 1/4W 144532 Ref. No. Description Part No. RES MF 221 OHM 1% 1/4W...
  • Page 34 PARTS LIST Cont’d Ref. No. Description Part No. CAP MONO 100PF 100V 10% NPO 061341 BALANCE SWITCHING LEFT PCB 750108 (Cont’d) CAP MONO 100PF 100V 10% NPO 061341 Ref. No. Description Part No. CAP MONO 100PF 100V 10% NPO 061341 RELAY REED FORM 1A 5V 500 OHMS 087050 CAP MONO 100PF 100V 10% NPO...
  • Page 35 C500 TUBE PREAMPLIFIER PARTS LIST Cont’d Ref. No. Description Part No. RES MF 1.5K 1% 1/4W 144539 METER PCB 750106 RES MF 806 OHM 1% 1/4W 144512 Ref. No. Description Part No. RES MF 10 OHM 1% 1/4W 144553 RES MF 100K 1% 1/4W 144528 CAP MONO .1UF 50V 20% Z5U...
  • Page 36 NOTES...

  • Page 37: Repacking Instructions

    C500 TUBE PREAMPLIFIER REPACKING INSTRUCTIONS Qty. Part No. Description 033838 Shipping carton only 034414 Foam inner carton top pad 033836 Inside carton only 034301 Bottom pad 017937 Plastic foot 400159 #10-32 x 3/4” Machine screws 4 404080 Washer flat #10 033837 Foam pad...
  • Page 38 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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