> On Jan 20, 2023, at 4:27 AM, Christian Corti via cctalk
> <[email protected]> wrote:
>
> On Thu, 19 Jan 2023, David Gesswein wrote:
>> Originally discussing RK05 head position sensor bulb. I have replaced it. The
>> offical part to replace it isn't available. You can open it up and put in
>> a new bulb. I wasn't able to quickly find what bulb I used a number of
>> years ago but if someone really needs to know I can dig further. One of the
>> small ones with wires. It doesn't use bulb with base. LED didn't work. I
>> think sensor is IR.
>
> I have also replaced it many years ago. I bought a hand full of 5V micro
> miniature light bulbs with wires. I think I bought them at Bürklin back then.
> Anyways, they were a 1:1 match and the replacement works like a charm. I
> guess that the filament orientation in the buld is important and that it
> should be parallel to the graticule.
From the looks of the setup (a Moiré system) you'd want reasonably uniform
illumination. So parallel to the graticule would spread out the light a bit.
paul
