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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 - 20
Main Right Schematic and PCB ..........................21 - 34
C500
SERIAL NO. YS1001 And Above
CONTENTS
SERVICE MANUAL
Serial Number YS1001 And Above
PREAMPLIFIER
Balanced I/O Left Schematic and PCB ................35 - 36
Balanced I/O Right Schematic and PCB ..............37 - 38
Balanced Switching Left Schematic and PCB ......39 - 40
Balanced Switching Right Schematic and PCB ....41 - 42
Meter Schematic and PCB ..................................43 - 44
Headphone Schematic and PCB ................................45
Parts List .............................................................47 - 56
Repacking Instructions ...............................................57
C500
PREAMPLIFIER

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Summary of Contents for McCulloch C500

  • Page 1: Table Of Contents

    C500 C500 PREAMPLIFIER PREAMPLIFIER SERIAL NO. YS1001 And Above CONTENTS Performance Specifications ..........2 Balanced I/O Left Schematic and PCB ....35 - 36 Notes ................2 Balanced I/O Right Schematic and PCB ....37 - 38 Rear Panel ..............3 Balanced Switching Left Schematic and PCB ..39 - 40 Section Location ............3...
  • Page 2: Performance Specifications

    Phono MC, 0.45mV for 2.5V rated output with the C500 Preamplifier and C500 Tube Pream- plifier. They are the ONLY cables to be used for Input Impedance connecting a C500 Controller to the C500 Pream- High Level: 22K ohms plifier or C500 Tube Preamplifier. Phono: MM, 47K ohms; 50 to 750pF, in 50pF steps MC: 25, 50, 100, 200, 500 or 1,000 ohms; 100pF...
  • Page 3: Rear Panel

    C500 PREAMPLIFIER REAR PANEL SECTION LOCATIONS TOP VIEW WITH COVER REMOVED...
  • Page 4: Block Diagram

    BLOCK DIAGRAM...
  • Page 5 C500 PREAMPLIFIER INTERCONNECT...
  • Page 6 MAIN LEFT 750103 SCH 1 OF 6...
  • Page 7 C500 PREAMPLIFIER MAIN LEFT 750103 SCH 2 OF 6...
  • Page 8 MAIN LEFT 750103 SCH 3 OF 6...
  • Page 9 C500 PREAMPLIFIER MAIN LEFT 750103 SCH 4 OF 6...
  • Page 10 MAIN LEFT 750103 SCH 5 OF 6...
  • Page 11 C500 PREAMPLIFIER MAIN LEFT 750103 SCH 6 OF 6...
  • Page 12 2 MAIN LEFT 750103 PCB...
  • Page 13 C500 PREAMPLIFIER MAIN RIGHT 750102 SCH 1 OF 6...
  • Page 14 MAIN RIGHT 750102 SCH 2 OF 6...
  • Page 15 C500 PREAMPLIFIER MAIN RIGHT 750102 SCH 3 OF 6...
  • Page 16 MAIN RIGHT 750102 SCH 4 OF 6...
  • Page 17 C500 PREAMPLIFIER MAIN RIGHT 750102 SCH 5 OF 6...
  • Page 18 MAIN RIGHT 750102 SCH 6 OF 6...
  • Page 19 C500 PREAMPLIFIER 3 MAIN RIGHT 750102 PCB...
  • Page 20 4 BALANCED I/O LEFT 750736 SCH and PCB...
  • Page 21 C500 PREAMPLIFIER 5 BALANCED I/O RIGHT 750737 SCH and PCB...
  • Page 22 6 BALANCED SWITCHING LEFT 750108 SCH and PCB...
  • Page 23 C500 PREAMPLIFIER 7 BALANCED SWITCHING RIGHT 750155 SCH and PCB...
  • Page 24 8 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 25 C500 PREAMPLIFIER 9 HEADPHONE 750262 SCH and PCB...
  • Page 26 NOTES...
  • Page 27: Parts List

    C500 PREAMPLIFIER PARTS LIST INTERCONNECT Ref. No. Description Part No. Ref. No. Description Part No. C61 CAP MONO 100PF 100V 10% NPO 061341 METER 124097 C62 CAP MONO 22PF 200V 10% NPO 061339 METER 124097 C63 CAP MONO 100PF 100V 10% NPO 061341 J1 CABLE ASSY DB25 CHASSIS 171859 C64 CAP MONO 1000PF 50V 10% NPO 061344 CABLE ASSY DB85 CHASSIS 171859 CAP ELECT 10UF 100VDC 066462 CAP ELECT 4.7UF 50V...
  • Page 28  MAIN LEFT PCB 750103 (Cont’d) Ref. No. Description Part No. Ref. No. Description Part No. C135 CAP ELECT 10UF 16V 066580 TRANSISTOR NPN SILICON 132317 C136 CAP MONO .1UF 50V 20% Z5U 061346 Q8 TRANSISTOR PNP SILICON 132304 C138 CAP MONO 100PF 100V 10% NPO 061341 TRANSISTOR PNP 132321 C139 CAP MONO .1UF 50V 20% Z5U 061346 Q10 TRANSISTOR PNP 120V 132255 C140 CAP MONO .1UF 50V 20% Z5U...
  • Page 29 C500 PREAMPLIFIER PARTS LIST Cont’d  MAIN LEFT PCB 750103 (Cont’d) Ref. No. Description Part No. Ref. No. Description Part No. RES MF 10K 1% 1/4W 144504 R110 RES MF 2.67K .5% 1/4W 144614 RES MF 10K 1% 1/4W 144504 R111 RES MF 1.91K .5% 1/4W...
  • Page 30   MAIN LEFT PCB 750103 (Cont’d) MAIN RIGHT PCB 750102 Ref. No. Description Part No. Ref. No. Description Part No. R183 RES MF 4.75K 1% 1/4W 144520 CAP ELECT 10UF 16V 066580 R184 RES MF 4.75K 1% 1/4W 144520 CAP ELECT 47UF 35V 066446 R185...
  • Page 31 C500 PREAMPLIFIER PARTS LIST Cont’d  MAIN RIGHT PCB 750102 (Cont’d) Ref. No. Description Part No. Ref. No. Description Part No. C163 CAP MONO .1UF 50V 20% Z5U 061346 CAP ELECT 10UF 50V 066445 C168 CAP MONO 22PF 200V 10% NPO 061339 CAP ELECT 47UF 35V 066446 DIODE SILICON 070174 C73 CAP MONO .1UF 50V 20% Z5U...
  • Page 32  MAIN RIGHT PCB 750102 (Cont’d) Ref. No. Description Part No. Ref. No. Description Part No. Q12 TRANSISTOR PNP 120V 132255 RES MF 1K 1% 1/4W 144513 Q13 TRANSISTOR PNP 132254 RES MF 1K 1% 1/4W 144513 Q14 TRANSISTOR PNP SILICON 132304 RES MF 4.75K 1% 1/4W 144520 Q15 TRANSISTOR PNP SILICON...
  • Page 33 C500 PREAMPLIFIER PARTS LIST Cont’d  MAIN RIGHT PCB 750102 (Cont’d) Ref. No. Description Part No. Ref. No. Description Part No. R111 RES MF 1.91K .5% 1/4W 144613 R184 RES MF 4.75K 1% 1/4W 144520 R112 RES FP 10 OHM 5% 1/4W...
  • Page 34   BALANCE I/O LEFT PCB 750736 BALANCE I/O RIGHT PCB 750737 (Cont’d) Ref. No. Description Part No. Ref. No. Description Part No. CAP ELECT 47UF 16V 066380 CAP ELECT 10UF 16V 066580 CAP ELECT 47UF 16V 066380 CAP ELECT 10UF 16V 066580 CAP ELECT 47UF 16V 066380...
  • Page 35 C500 PREAMPLIFIER PARTS LIST Cont’d   BALANCE SWITCHING RIGHT PCB 750155 BALANCE SWITCHING LEFT PCB 750108 (Con’t.) Ref. No. Description Part No. Ref. No. Description Part No. CAP ELECT 10UF 50V 066445 C17 CAP MONO .1UF 50V 20% Z5U 061346 CAP MONO 100PF 100V 10% NPO 061341 C18 CAP MONO .1UF 50V 20% Z5U...
  • Page 36 PARTS LIST Cont’d  BALANCE SWITCHING RIGHT PCB 750155 (Cont’d) Ref. No. Description Part No. Ref. No. Description Part No. CONNECTOR HEADER 2PIN RT ANGLE 117873 RES MF 2.21 OHM 1% 1/4W 144607 PCB1 PC BD METER 129762 RES MF 10K 1% 1/4W 144504 RES MF 10K 1% 1/4W 144504 TRANSISTOR NPN SILICON...
  • Page 37: Repacking Instructions

    C500 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 C500 PREAMPLIFIER SERVICE MANUAL SERIAL NO. YS1001 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.