Up for sale here is this set of 3 replacement light bulbs for the Yamaha C-4 amplifier power button, tone bypass, mute button. These are new bulbs to replace the original bulbs for the power button, tone bypass button, and mute button ONLY.

These are top-quality bulbs, and are the exact same ones I use when I rebuild vintage gear. 

Specs:
Type: Incandescent
Voltage: 12v AC/DC
Current Draw: 70mA
Color: Warm White
Wire Length: 6.875 inches (175mm)
Bulb Diameter: 3.8mm
Bulb Length: 10mm
Polarity: Non-polar

You will need a Philips screwdriver, soldering iron, solder, needlenose pliers, and wire cutters. 

All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.