I found a schematic of a McIntosh MC60, Type A-121 Power Amplifier date 4-20-1956 at the Internet.

https://www.thetubestore.com/lib/thetubestore/schematics/McIntosh/McIntosh-MC60-Schematic-and-voltages-chart.pdf

https://www.thetubestore.com/lib/thetubestore/schematics/McIntosh/McIntosh-MC60-Service-Manual-parts-list-Schematic.pdf

Parts I used:

Mains: Neutrik PowerCon

PSU Trafo: Amplimo 7N607

Audio Output LS Connector:

Audio Output Trafo: VDV-1070-UC-PPS

Audio Line Level: Neutrik XLR3, input Male, pin 1 common, pin 2+3 audio signal

Electrolytic Capacitors:

Capcitors: CDE Film Capcitors, Cornell Dubliner (ORANGE DROP)

Resistors: Metal Film 1%