MC2100-BR1
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Archive for March 2026
MAC4100 Power Supply Board
045217-PAE
This board is a reproduction of McIntosh PCB 128279 which implements the power supply, protector, and headphone attenuator circuits in the MAC4100 receiver (assembly number 045217). The board layout follows that of the original, and no changes were made to the circuit design. The new PCB is manufactured with plated through-holes and 2-ounce copper to make the board more robust in the event that future repairs are needed. Silkscreen reference designators were also added to aid assembly.
MC2150 Preamp/Driver Board
045863-PAE
This board is a reproduction of McIntosh PCB 128412 which implements the preamplifier, power amplifier driver, and power guard circuits in the MC2150 power amplifier (assembly number 045863). Slight layout changes were made to accommodate substitution of TO-202 voltage amplifier and current source transistors Q407 and Q414 with newer TO-126 devices, but the board layout otherwise closely follows that of the original. No changes were made to the circuit design. The new PCB is manufactured with plated through-holes to make the board more robust in the event that future repairs are needed, and silkscreen reference designators were also added to aid assembly.