Linn Bedrok LP12 Plinth Upgrade

Alignment LP, one side smooth for observing/setting anti-skate

@elliottbnewcombjr

Datum II & IIs

The Datum I was manufactured by Syrinx and up to that point had threaded posts and nuts to mount.

Logic aquired Syrinx and made in house the Datum II & IIs with the three point mounting collar. They mounted both Datum’s on their DM101 and Logic Tempo turntables.

Mounting hole 30.5mm

Effective length 228mm

Pivot to spindle 210.7mm

Overhang 17.3mm

Azimuth is adjustable by two bolts.

You are correct the counter balance is very up close to the pivot due to the tungston counter weight.

All of the Syrinx arms…LE1, up to the Datum I had the same measurements and these were carried over to the Logic produced Datum II & IIs

One thing to note is that when Logic folded the companies stock was bought by Manticore Systems Engineering. Their well liked Mantra turntable was a leading model in the UK. The later Datum IIs arms were modified to their new specs under the MSE logo which appears on the arm pivot. Superior bearings and improved external finishing also cured the anodising effect of UV in earlier models.

A Datum IIs with the silver wire was considered better than the Linn Ittok LV3 Mk2 and considerably less expensive. The Datum I, Syrinx PU2 and PU3 models were claimed by some to be ‘’Ittok Killers’’ within their individual timeframes.

Search the ‘’Vinyl Engine’’ archives further to confirm this information if you wish. l own a few Syrinx arms so l am sure l have given you the correct info.

watch the video

https://www.youtube.com/watch?v=SqP4eHBSlI4&t=2s

minute 5, the shaft simply drops into the bearing with no resistance

clunk

he removes it, adds a few drops of oil, it simply drops in again

clunk again.

There is no way in the world that that can be considered fine tolerances. and what makes the clunk noise? shouldn't it be zero contact floating on oil?

minute 6, drop the tonearm post in the mount indicates no close fit either.

This video is shocking. The guy has no idea of how to put a turntable together.

Not only is the bearing housing and shaft as loose as a goose,

 he puts no oil on the spindle before insertion.

In tight tolerance bearings you always smear oil around the spindle before insertion to avoid scouring when inserting.

Unbelievable - and the video reminds me of what a rube Goldberg contraption the Linn is along with the low tech bearing and motor the size of a weenie.

@dover

The guy is Gordon Inch at Linn. I found him to be very approachable.

He’ll no doubt be interested to hear your views on turntable set up.

https://www.facebook.com/share/1Bx1f5zKML/

Let me know how you get on.

@newton_john Tonight I asked a well respected mechanical engineer if the Linn bearing that Dover and others claims is not put together accurately, is in fact that. The gentleman told me that clearly the folks denigrating the Linn bearing design really do not understand how this particular Linn bearing functions.

Dover and the other naysayers clearly have a lot to discover...as you are pointing out.LOL.