Linn Bedrok LP12 Plinth Upgrade

@dover

You are talking about newer more refined engineering with your Vertere and years more thought in engineering so l would expect that too.

@elliottbnewcombjr was talking about a 50 year old Thorens TT that cost probably £150 or even less back then, so a comparison is not really a big deal here.

To Elliot…..

The unique six spring suspension (not compression), massive plinth and over engineered 8mm sub-chassis were always the reasons for the bass response in the Logic. No matter which MK model owned with or without the centre spring mod for heavier arms, the models were notably oblivious to footfall and vibrational feed back. The ‘secret’ is the configuration of the 6 spring suspension.

The bearing was also well engineered for its period and noted in reviews at the time. The three point six spring suspension as far as l know has never been used on any other TT. The DM101 beast is built like a tank.

dover

I’ve never seen any Vertere model, that kind of precision is beyond impressive, it’s downright scary.

The fit of the posts of the SME, Acos Lustre, JVC-Victor tonearms are all similar: snug, mated, properly aligned while making refined adjustments.

My 12.5" long tonearm from Russia, the post is not tightly fit, goes into it’s base plate very easily, like the Linn arm does in that video. They think it’s ok if it’s held in place by a set screw. I had them modify the base for 2 set screws (enhanced inconvenience, eh), and I added a layer of very thin tape around the post, a much finer fit, stays aligned while adjusting it’s height (with it’s built-in micrometer which is a nice feature).

@elliottbnewcombjr 

Just an after thought.

Logic had Syrinx manufacture their mounted tonearms originally but later developed their own Datum II and the highly regarded Datum IIS. I have known people who have bought a turntable just to lay their hands on a rare Datum IIS

mylogic

I found the Datum II and IIs silver wire version, it appears they changed the mount from a threaded post and nut below deck to a Jelco Type surface mounted 3 screw base plate, am I correct about that? I prefer removable headshells. They do not mention it, but I think I read that the Datum II and IIS includes azimuth adjustment at the end of the arm, I see what look like 2 screws

I just mounted my new to me Vintage JVC Victor UA-7082 11-1/8" long arm. It's counterweight section's rubber isolation sag was properly repaired. The anti-skate adjustment is the smoothest I ever encountered, like the Acos Lustre GST-801 it is easy to adjust while playing/listening, although I prefer setting it while lowered onto the smooth side of my alignment disc

. After releasing the JVC height locking ring, then you can place the stylus and adjust the height while playing, however final locking is a two handed job, not while playing.

My Acos Lustre GST-801 which I learned about here is my favorite arm, easy to release/adjust/lock everything while playing: height/tracking force/anti-skate. I use an AT headshell with azimuth adjustment. I wish they made a long version of it.

I just noticed, the Logic Datum II looks to have a very compact/short length counter-weight section, it might fit on the left side where my Mission/Jelco 774 is, I will need the measurement from pivot to the rear end, and I need to double check the overall height for clearance when the dust cover is on

This still shows the 12.5" blackbird arm, I removed it, spun the armboard around 180 degrees, and used the original hole that the 45 adapter is show in, where the original 7082 arm was.

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