I’m restoring a very early Apple II plus in order to sell. I believe that this particular unit is a very unusual example of an Apple II plus, as it has the second style keyboard with “domed” power light.
The bulb in this power light was burned out, so I did some searching and found an exact replacement is still available.
The bulb on the left is the replacement and the one on the right is the burned out original. The bulb type is a #680 miniature bulb with a wire terminal base. You can find these bulbs for 31 cents each, plus shipping, at www.bulbtown.com. Here is a direct link:
https://www.bulbtown.com/680_Miniature_Bulb_Wire_Terminal_Base_p/680.htm
In case this link goes away at some point, here are the specs:
| #680 Miniature Bulb Wire Terminal Base – 5 Volt .06 Amp 0.3 Watt T-1 Wire Terminal Base, .03 MSCP C-2R Filament Design. 0.25″ (6.4mm) Maximum Overall Length (M.O.L.), 0.13″ (3.2mm) Maximum Outer Diameter (M.O.D.). 60,000 Average Rated Hours. |
I’ve run this system over the course of many hours with the new bulb installed. The illumination is exactly the same as with an original bulb and there are no problems with the amount heat generated by the replacement bulb.
This lamp is only a replacement for the bare wire lead bulbs present in early keyboards, as later Apple II keyboards have a different style keyboard power lamp.
See my early Apple II keyboard page for more information on early Apple II keyboards.