8v snap-in White LED fuse lamps.  These are perfect for replacing any of the 8v, 7v, and 6.3v fuse lamps found in vintage stereo gear like receivers amps etc..  Marantz, Pioneer, Sansui, Kenwood, they all used them.  These are 29mm long.  LEDs run cooler, last almost forever, and draw much less current than the old incandescent bulbs.  

10-Pack of Bulbs

Type: LED
Voltage: 8v AC/DC (they will work fine at 6.3v, 7v, or 8v)
Current Draw: 20mA

Color: White
Length: 29mm

Diameter: 6mm

Polarity: Non-polar