Anyone Using A Logic Turntable?

I first heard the Logic DM101 being demonstated by Logic at the Harrogate International Festival of Sound in August 1980 with some serious amplification and Yamaha NS1000M speakers and it blew me away. I purchased a DM101 second hand in 1986 with the modified suspension and fitted with a Syrinx PU2. I installed a Nagoaka MP50 cartridge and the setup is the same now. Logging onto this site is as a consequence of the fact that this unit is shortly to become a refurbishment project. It is currently operational but with a cut & shut Linn belt. I have also acquired a Target Audio wall-mounted turntable table that I will be mating it with.
If it is of any interest I will give you the benefit of my experience snagging the unit back at that time.
1)The initial problem I encountered was where upon switch-on the platter would run clockwise or ACW with lack of torque. This was due to the capacitor phase lag stator bobbin in the motor being open circuit. This break was resoldered and the problem was fixed. It was stated in some early reviews that long term speed variation was prevailant. I have never experienced any such problem.
2) To get your Logic DM101 to run at 45RPM, position the belt on the appropriate pully's but instead of hitting the motor switch try spinning the platter up to speed maually first and then hit the switch. you will find that it will run at 45RPM. When you have finished playing 45 RPM records, hit the switch with the platter at standstill and the belt will default back to the 33.3RPM pulley's.
3) If you have a Syrinx PU2 it is absolutely imperitive that the subchassis is levelled with a spirit level otherwise the offset gimbal bearings ensure that the arm gains inertia and the cartridge leaves the record like an aircraft taking off.
4) The lubricant that is currently in my bearing assembly is Hypoy EP80 gear oil and although I strongly suspect that the viscosity is greater than the original I have had no problems with bearing failure. Can anyone advise as to the correct specification and availability for the lubricant?
5) To test how effective the unit's immunity to acoustic feedback is lower the arm onto the surface of a record with the platter at a standstill and advance the gain control on your amp-no feedback howl. Remember to turn the gain control back down before lifting the arm. I have carried out this test with confidence with my system, 23 year old Yamaha NS1000M's and 2 x 16 year old kit-constucted John Linsley Hood 117 WRMS MOSFET monoblocks.
The practical knock-on benefit of this virtue is that bass reproduction is rock solid and percussive slam is absolutely awsome.
Any tips or help on tweaking or refurbishment from those that know greatfully recieved.
Regards.
Chris jackson.

I have the Logic turntable, since 1992, veryhappy with it, without any problem with the 45RPM.
But I would like to change the springs, belt, an possibly improve the motor. Is there anybody that could help?, I do not know where to go buying those spares.
thanks Javier

I read about the Logic turntable in the defunct, "Hi-Fi Answers" magazine. They may have had one review there.

Hi,

I bought one not too long ago for its tonearm. I never tried it, but I thought I would take it apart for you guys. :)

Anyway, it is interesting in that the suspension consists of six springs horizontally mounted in pairs linked by a grommet in the middle. This creates a simple, but effective, three-point suspension. It is a very clever implementation, not terribly unlike the way the motor is mounted in a Garrard 301. I believe it could be the smartest springy design of the period. It is also a place that allows for tweaking by changing the factory springs with stiffer ones.

The base consists of two pieces of mdf laminated together, and the motor is mounted on it, not on the subchassis, like some springies. This gives a measure of isolation.

Speaking of the subchassis, it is a heavy 10mm aluminum plate that is cut with an SME slot, and configured in such a way that it should balance the typical tonearm well without a need to unduly stretch any of the springs. The best part is that it doesn't rely on a separate armboard, so the coupling there is positive.

The bearing well is also nice for the type turntable. It is remarkably heavy for a turntable in the price range, and construction is good. The spindle is fixed to the subplatter, but nicely finished. The only downside I see is that the steel ball is not captive. The original Thorens TD150 is better in that regard. Still, it is well made.

Both the subplatter and the main platter are finished well, and they fit together with precision. Best of all, the felt donut is attached to the main platter. I always despised those mats that slipped around. This one is a step up in that regard. The platter and subplatter appear to be aluminum, not zinc, and both are clear anodized. I see that as a plus, too.

The motor, like that in other springies, is not to die for. I see it as the best place to tweak the turntable. Mine was so crappy that it showed up in two pieces, although the shipper packaged the turntable very well. I put it back together, and it works, however. I don't see why it couldn't be upgraded, if you owners are so inclined. Still, it isn't as bad as some out there.

Other details are present, like a really hefty powercord for a turntable, a good switch, covers over parts that shouldn't be exposed, a decent lid, etc.

I believe Logic put a lot of thought and money into the turntable for no more than it retailed for back then. That made it a bargain, and probably is why they went out of business.

I own a Linn and a few Thorens springies, but it is my opinion that this old Logic DM 101 may be the pick of the litter.