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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, May 26, 2012

Beomaster 6000 Heat Sink Temperature

I recently fixed the output stage of a Beomaster 6000 and adjusted the quiet current to specifications. I thought it would be interesting to know what the corresponding heat sink temperatures are for future diagnostic purposes. Here is what I measured with a digital IR thermometer on the top of the 'cooling tower' in the back of the BM6000:

After ~1 hr of listening to the radio (volume set to 10) the right half of the cooling tower measured about 42-44C, while the left half measured 38-40C. The reason for this difference is that the right side houses the power supply, i.e. more heat is dissipated there. I expect that these numbers vary depending on the ambient temperature of the location. When I measured, it was about 20C.
If the BM6000 delivers temperatures significantly higher than the above values, I would think that the quiet current needs some adjustment.

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