I am assuming that you are talking about the meter bulbs? If so they are incandescent and plug into sockets. Other lamps are LED's which are soldered into a board. The manual for this amp is at McIntosh MC602 Stereo Power Amplifier Manual | HiFi Engine. I looked at the service manual and if you are good with tools it should not be that difficult. My guess is they are probably standard, may still be available online or even at an auto parts store. I personally haven't worked on this amplifier but have done a few Macs in the past. Maybe oldhvymec would be a good person to answer this question?
bulbs
i have a mcintosh mc602 with a few bulbs that are out. is it hard to replace them??