mcintosh bulb need to be replace

Order them from McIntosh they are about 1.00 each, if you are replacing one and they are soldered in (as most are) replace them all or you be doing them one at a time. If you are going to do it yourself order the service manual (about 15-20 dollars) while you are at it. Having the blowup drawings is a big help.

If the bulbs require soldering, therefore, a trip to your local tech, I would swap out the bulbs and go for LED for a maintenance free illumination.

Here's a PDF version of the service manual:
Service-Manual

These may be just the ticket:
Blue-LED-Meter-Lamp-Set-Beautiful

Audio Classics in Vestal, NY does the conversion to LED.