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Beolover SyncDrive: DC Platter Motor Replacement for Beogram 4002 and 4004 (Type 551x and 552x)

Late Beogram 4002 and the 4004 (Types 551x and 552x), which have DC platter motors instead of the earlier synchronous AC motors usually suff...

Saturday, April 8, 2017

Beogram 6000 (5512): Replacing the Light Bulbs in the RPM Trimmer Panel with LED Assemblies

After rebuilding the main PCB the next step for this Beogram 6000 (5512) was to replace the light bulbs that back-illuminate the RPM trimmer scales in the control panel. Aside from their much better longevity, LEDs also emit much less heat than incandescent light bulbs and that reduces thermal gradients within the RPM potentiometers. This is beneficial for the long term RPM stability of these units. 
This shows the RPM panel extracted from the Beogram:
and with covers removed:
The bulbs need to be unsoldered and then pulled out:
Then the LED assemblies can be soldered in. This shows the units before installation:
and here inserted:
and with closed covers:
The LED assemblies are drop in replacement parts for the original bulbs and do not need any further circuit modification. They are available to other B&O enthusiasts. Just send me an email or use the contact form on the blog. Here is an impression of the 33 RPM LED replacement in action.





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