These lamps are suitable replacement for the tone selector lamps, or bulbs.
These will also replace the lamps inside of the Yamaha GS-1 and perhaps other early Yamaha synthesizers that use that button actuator.
Technically speaking, mind the following:
– The brightness and temperature of these lamps are the same as the originals and can be used along side originals. They do not stand out in any way once the button cover is on.
– These are slightly larger in size to the originals, but still fit the original rubber lamp holder
– These consume less current than the originals- a good thing!