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For MC2100, MC2105, MC2300 (Assy. 043-795, 044-331, 044-650)
Thank you for your order! This is a replacement input preamplifier board used in the McIntosh MC2100,
MC2105, and MC2300 power amplifiers. It is designed to be a drop-in replacement, and no changes were
made to the original circuit design.
The new PCB uses 2-ounce copper with a gold finish, plated through-holes, slightly wider traces, and
has silkscreen labels on both sides. Electrolytic capacitor footprints allow the use of both radial and axial
capacitors, and the output electrolytic caps can be substituted with film caps of the appropriate size. Robust
wiring turrets replace the original hollow posts that wires solder to.
This kit includes all necessary wiring turrets, but other components (resistors, capacitors, transistors,
etc.) are not included. Please refer to the included schematic, board layout, parts list, and cross reference table
which compiles information from the MC2100, MC2105, and MC2300 service manuals.
If you have any questions, concerns, or feedback, please feel free to send us a message:
An electronic copy of this document is available at: www.proaudioe.com/128-165-PAE-U
Replacement McIntosh Input PCB 128-165-PAE
ProAudio Electronics
www.proaudioe.com/contact
parts@proaudioe.com
www.ebay.com/usr/usart009
www.proaudioe.com
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Summary of Contents for PROAUDIO ELECTRONICS MC2100
- Page 1 ProAudio Electronics www.proaudioe.com Thank you for your order! This is a replacement input preamplifier board used in the McIntosh MC2100, MC2105, and MC2300 power amplifiers. It is designed to be a drop-in replacement, and no changes were made to the original circuit design.
- Page 2 * Some capacitor values changed between serial number ranges. Please see the “Schematic Notes” section of the McIntosh service manual for your model ** Based on measurements from an MC2100 board. Depending on your unit, parts of slightly different sizes may have been used...
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Page 4: Board Layout
Board Layout... - Page 5 Original Board Layouts In the MC2105 and MC2300 service manuals, pins 11 and 12 are swapped on the board layout diagram and do not match their corresponding schematics. This was a simple numbering error and does not affect the wiring scheme...
- Page 6 Original resistors were 10% tolerance, ½ watt unless otherwise specified • This parts list combines information from the MC2100, MC2105, and MC2300 service manuals. It is possible that some component value changes were not recorded in the McIntosh documentation; please compare your component values and part numbers against those on your original board and...
- Page 7 McIntosh Semiconductor Cross Reference Information • The semiconductor cross reference information below is borrowed from the McIntosh 1975 semiconductor cross reference datasheet. Commercial (non-McIntosh) part numbers from the datasheet are italicized. The column on the right can be used to write down your own substitute part numbers McIntosh P/N Type...
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Page 8: Installation
In the MC2100/2105/2300, this is accomplished by grounding the input RCA jacks directly to the chassis, hence why step 6 is emphasized. - Page 9 5. Once the board is assembled, solder the cables to the turrets 6. Make sure the shields of the input RCA jacks are making a solid connection to chassis ground, and that these ground connections are solid all the way from the jacks to the volume pots and the input preamp board 7.
- Page 10 For MC2100 units, it is critical that the stereo/mono switch be in good working order while operating the unit in mono mode. Because both 4 Ohm taps of the autoformers are tied together in mono, a failing switch could potentially result in a situation where both channels are not receiving the same signal, causing the output stages to drive each other.
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