2. analog
  3. 1339447268

Trans Fi Salvation direct rim drive turntable

Hi A'goners, I've just bought this turntable, confident it'll be my last upgrade. The rest of my system is a Tom Evans Groove Plus SRX phono stage, EMM Labs CDSA SE cd player, Hovland HP200 pre/Radia power amps, Zu Definitions Mk 4 loudspeakers, so a pretty good way to listen to vinyl.

Over the years, since 1995 I've progressed from a Roksan Xerxes/Artemiz/Shiraz, via a Michell Orbe/SME V/Transfiguration Orpheus, finally ending up last week with my new Trans Fi Salvation/Trans Fi T3Pro Terminator/Zu modded Denon 103.

This turntable (£2500 UK price, approx $4000-$5000 US) is the brainchild of Vic, a retired dentist, who, fed up with the shortcomings of belt drive and traditionally-pivoted tone arms, literally from the ground up devised first the Terminator air bearing linear tracking tone arm (now in T3Pro guise as on my system), and now the direct rim drive Salvation turntable, a technology in direct opposition to the hegemony of belt drive we've come to accept from the '70s.

In summary, he has developed a motor that directly rim drives an oversize platter. The magic is that vibrations are drained away from the platter and hence stylus. So minimal rumble is transmitted, the weakness of Garrards/Lencos in the past. This is mated to a substantial slate plinth which does a great job of isolating the whole rig from external vibrations.

Where this differs from direct drive is that the torque applied is high enough to counteract stylus drag, but it is strictly analogue controlled ie no digital feedback applying constant micro speed control. Speed is set correctly, torque is sufficient, and speed stability is like a rock.

This is combined with his air bearing linear tracking arm, discussed on other threads.

So technical description over, how about how it sounds? Well, years ago I always assumed the overhang in bass when playing lps on my previous belt drive/pivoted arm tts, apparent as a benign artifact, was all part of the 'romance' of vinyl, esp. when compared to the dry, clinical sound of early cd. But in 2007 I acquired the EMM cd, which had a natural analogue sound playing silver discs, but none of this bass colouration. On studying the growing reemergence of idler/direct drive, and their superiority in maintaining speed stability, I agreed that the belt speed instability might be introducing this.

Two years ago I came across Vic, and now I can report that eliminating the belt for high torque rim drive has taken this whole artifact out of the equation. Whole layers of previously masked information like rhythm guitars are now present, treble information has abundant naturalness and decay, and bass, which appears to be less in quantity compared to belt, is actually more accurate with a real start-stop quality, much more like digital, and the real thing. The other positives are more linked to the arm, including uncanny tracking across the whole record side; I'm really not exaggerating in saying that the last few grooves at the end of an lp side are as solidly reproduced as the first. Music with strong dynamic contrasts are really served well by the Salvation, and I am shocked at how good this all is after trepidation that the sound might be hyperdetailed but too assertive etc. In fact music is reproduced with a relaxed incision, and a welcoming detailed transparency.

The amazing thing is that all of this is not in anyway at the expense of the natural warmth and tonal dimensionality that still puts vinyl way ahead of any digital (imho).

The only thing, and Vic would like this to be known, is that his creation is a cottage industry, and he can only produce limited numbers to order.

I'm happy to answer qs on it, as I really want our community to know about a possible world beating product at real world prices. My tech knowledge will be limited, but no problem discussing sound quality issues.

I'm not affiliated in anyway to the product, just sold my Orbe on ebay and bought this. Regards to all
spiritofmusic
lewm
12,852 posts
 
Yes, I was aware of the fact that the magnetic suspension serves to take some of the load off the bearing, but there is still some load. I was not aware of the mechanism, however. Thanks.

When I first got my L07D, before I had installed the platter, I was concerned that the bearing was "frozen", because the spindle could not be rotated by hand. I subsequently learned that the magnets push the spindle assembly full up against its stops, with no platter. The weight of the platter then forces the spindle/bearing assembly to "relax".
richardkrebs
422 posts
 
Lew.
I to was alarmed with an apparently locked bearing when I received a LO7D to upgrade.
There are small plastic targets on the motor coil side of the PCB. These prevent the rotor from contacting the coils when no platter is installed.

The idea is so outside the box and likely predates the current crop of magnetic de-loading bearings.
lewm
12,852 posts
 
The motor itself, of course, is a copy of the Dual coreless motor that preceded it. I think we've discussed this before. You or someone else offered that Kenwood had to change the design of the motor stators so as to avoid violation of the Dual patent, in their last several tt's. But sorry. This is OT, as it does not relate to the Transfi, another apparently excellent tt.
thekong
203 posts
 
Just for clarity, the LO7D uses the rotor magnets to remove 'some' of the vertical load on the thrust bearing (steel ball and hard plastic). It is not actually suspended in that there is mechanical contact.

Hi Richard, Lewm,

As I understand, there are (at least) 2 ways to implement a magnetically “suspended” bearing, one is a true suspension with no mechanical contact in the vertical axis, another is partial suspension, which only reduce the vertical load on the bearing (as in the L07D, and a couple other belt drive TTs).

I always thought the true suspension method had a problem as the platter could go up and down, albeit only very slightly. To my way of thinking, since the platter can never be 100% balanced, there got to be some “wobbling” (again, microscopically) if there is no mechanical contact in the vertical axis, and that just cannot be a good thing.

Would be interested on your thought on the issue!

Thanks!
richardkrebs
422 posts
 
Thekong.

At the risk of annoying a bunch of people ... I cannot see how a pure magnetic suspended main bearing can provide the necessary loop rigidity. I doubt that it is self compensating like say a captive air bearing, so it is prone to vertical movement. That induced by platter balance and drive issues and yes, stylus acceleration. My experiments with thrust pads has shown that harder always seems to be better. Putting something soft there has a deleterious effect. Mag force follows the inverse square law so it could be argued that it is stable under a varying load. This I doubt.
Happy to be proved wrong.
Sure a mag bearing is quiet but IMO it would compromise one of the fundamental design criteria of a TT. Absolute dynamic dimensional stability between platter surface and arm. It would be very interesting to place a DTI on the platter surface of a mag bearing TT and then apply a small vertical force on the platter. I suspect that the indicator will show vertical movement and possibly bounce.
The LO7D has a quite thin metal disc under its thrust pad. It is inevitable that with the weight of the platter it would deflect microscopically, but there is an adjustable bolt that contacts with the centre of this disc and the chassis. The bolt improves dynamic loop rigidity. If you own one, try loosening it to hear the negative effect of a tiny reduction of loop rigidity. (do this at your own risk!)
It could also be argued that the noise a mechanical bearing makes is evidence of movement. True, but correctly designed and polished they produce extremely low subjective noise levels.
I say all this from a theoretical perspective having not heard a mag bearing TT in suitable conditions. I am happy to defer to the superior knowledge of a mag bearing designer. Feel free to ignore everything I have just said, its just a bit of fun.
More to discover