Up for sale here is this set of 5 new grain-of-wheat light bulbs. These are 28v (AC or DC) 40mA incandescent bulbs. The bulbs are 4mm in diameter. These are nice warm white light bulbs and would work great for you. They are perfect for replacing the direction light bulbs in the Pioneer RT-707. These are a tiny bit smaller than the original bulbs, so you may need to use little bit of heat-shrink or a drop of white glue to hold them in place. Please see my pictures for details.
Specs:
Voltage: 28v AC/DC
Current Draw: 40mA
Voltage: 28v AC/DC
Current Draw: 40mA
Color: Warm White
Bulb Length: 10.25mm
Bulb Length: 10.25mm
Diameter: 4mm
Wire length: 38mm
Polarity: Non-polar
US shipping and handling is $5, and international is $18, no matter what quantity you buy. 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.
Looking for more parts? I have power switches, feet, pushbuttons, top case screws, bottom screws, faceplate screws, white LED fuse lamps, blue LED fuse lamps, 6.3v bi-pin bulbs, 8v bi-pin bulbs, 12v bi-pin bulbs, wired 8v 60ma bulbs, new power cords, new main capacitors for the Marantz 1060/2230, wired Pioneer speaker plug replacements, new 630v yellow film capacitors at 13 different values, a large variety of transistors for vintage stereo repair, and more. Just use "add to cart" on everything you want and then check out for combined shipping.