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trying to understand the Linn motor

I have an old Valhalla Linn and it may be time to change its motor.
The board has been serviced and all caps upgraded.
As far as I can tell, the board produces 85 volts at 50 Hz.
If I am wrong on this, please let me know.

However, the motor on the Linn (Premotec 9904 111 31813) is 
rated at 110 volts (with -15% +10% voltage tolerance according to its spec).
This indicates that the motor should not be driven with less than
93.5 volts (-15%).

So, what am I missing ?

Thanks


128x128cakyol

Showing 2 responses by teo_audio

teo_audio
932 posts
 
Valhalla boards need to be refreshed, they tend to eat themselves through thermal wear. Off or on. I kept my valhalla’d LP12 on a power bar switched power arrangement and only powered up the table with 120vac, when it was time to use the table. But I see you’ve refreshed the board. They can literally burn the boards out and traces right off. (long term thermal stressing)

Another option is the very decent Hercules board for finally having 33/45 on the same table and to keep the 50hz motor. (Used original Lingos suffer the same thermal fate and need to be rebuilt.)

Both the lingo,and the Valhalla have the two stage power thing going on...and I think the Hercules as well.

It is an easy swap. (the Hercules board)

Soft foam earplugs are good for plugging the bearing well when flipping the table over to do the board swap.
https://www.ebay.com/itm/HERCULES-II-Linn-LP12-NEW-33-45rpm-CE-WORLDWIDE-50-60Hz-110-230v-Easy-to-Fi...
teo_audio
932 posts
 
My memory is faulty on that re the two step voltage thing... as I lowered the voltage of the sine on my rebuilt Valhalla board and now sometimes assist the platter when it is spinning up.

Never bothered with the lingo yet, as....I'm waiting for the right auction/sales snipe moment.

Cheap ass, like many analog guys. So cheap (and dedicated) I got into the audio business, to get closer to the source point.
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