A crucial step to make 400x Beograms 'fit for the future' is to replace their incandescent light bulbs with LEDs, which tend to last for a very long time. This helps preventing future breakdowns and trips to Beolover's bench. The RPM control panel of the Beogram 4004 contains two bulbs that provide the scale illumination. This shows the removed panel of the 4004 that I am currently restoring:
The first step is removing the bulb covers:
Then the bulbs can be unsoldered:
And replaced with the LED assemblies. This shows the assemblies pre-installation:
and after install:
They are designed to be 'drop-in', i.e. just connect like the original bulbs. The final steps are putting the covers back on
and trying them out:
The 'natural' incandescent-like glow is a result of using carefully tuned red/green LEDs on the assemblies. On to the DC motor!
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