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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, January 16, 2016

Beogram 4002 (5513): Adjustment of Sub-Chassis, Platter Height, Tonearm Lowering Limits and Tracking Weight

With the top aluminum plates now properly seated I was able to do the sub-chassis and platter adjustment, which by itself form the basis for the adjustment of the arm lowering limits and finally of the tracking force. After that this Beogram will be ready for a first test drive. I have blogged about the chassis and platter adjustment process extensively and there are two videos on my YouTube channel that show how to adjust the platter bearing and the subchassis (in a Beogram 4000, but the process is very similar in the 4002). So I am only showing the end result here, a platter that is flush with the surrounding aluminum plates and that is centric to the cutout in the aluminum plate:
After this it was time to adjust the arm lowering limits. This is a very important adjustment since it may save your cartridge some day down the road in the event of a failing light sensor in the sensor arm, which will allow the system to lower the arm even if there is no record present. And of that happens, the needle better not hit the black 'ribs' that are on the platter. For that reason there are the lowered section where the set-down points are, that one can adjust the arm limit to keep the needle above the ribs but well able to descend into a groove on a record. There is another video on my youTube channel that shows how to adjust the lowering limits
Here is an impression of the end result. The needle is just a tad above the lower part of the ribs:
Once the limit is established, the arm should be calibrated for proper tracking weight. I do this now at the 1g setting since that is the setting range that is interesting. And of course there is yet another video that shows this process!...;-). This shows the tracking force gauge for a well calibrated arm at 1g:
After all this was done, I connected the Beogram to my Beomaster 6000 4-Channel and listened to my most recent vinyl acquisition, the seminal "In-a-gadda-da-vida" by the Iron Butterfly. I just love the drum part in the middle of this psychedelic delight!...admittedly a somewhat acquired taste, but that is part of the Beolove equation!



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