"D Peter Maus" wrote

This doesn't directly answer your question, but for my 3000-1, I
pulled a white LED out of my stray parts box and soldered it into
the base of the burned out bulb. I put a thin white paper cover
around the element to disperse bright but narrow beam thoughout
scale tube.

I'm not familiar with the 3000. But, if you need to disperse the light from
an LED you can "frost" the plastic lens by lightly scuffing it with a piece
of fine sandpaper.