[Arran]

With regard to using blue LEDs in Marantz receivers like a 2215B, I wouldn't. I was researching what dial lamps I needed for a Marantz I have and ran across photos on some websites of 70s era rigs using blue LEDs and they just don't look right, it makes it look like it's lit by blue LED Christmas lights. I settled on using regular 8 volt fuse style pilot lamps instead, for some reason I could not find a source of warm white LED substitutes, just the blue ones.
Regards
Arran