Eminent Technology ET-2 Tonearm Owners



Where are you? What mods have you done ?

I have been using these ET2's for over 9 years now.
I am still figuring them out and learning from them. They can be modified in so many ways. Bruce Thigpen laid down the GENIUS behind this tonearm over 20 years ago. Some of you have owned them for over 20 years !

Tell us your secrets.

New owners – what questions do you have ?

We may even be able to coax Bruce to post here. :^)

There are so many modifications that can be done.

Dressing of the wire with this arm is critical to get optimum sonics along with proper counterweight setup.

Let me start it off.

Please tell us what you have found to be the best wire for the ET-2 tonearm ? One that is pliable/doesn’t crink or curl. Whats the best way of dressing it so it doesn’t impact the arm. Through the spindle - Over the manifold - Below manifold ? What have you come up with ?
128x128ct0517
Ct0517 - I would not run an ET downhill, but I get the overhang argument.

NOW HERE IS ANOTHER POSER to ponder :

With a pivoted arm we have an overhang. The pivot arm/stylus tip moves in an arc, which means that for every 1.8 seconds ( 1 rotation ) the stylus tip has actually moved slightly forward with each rotation.
Put another way if you put the stylus tip in the first groove, and draw a tangent to the spindle centre, then with each rotation the stylus tip will move further ahead from that tangent.

This means that to achieve the correct playback speed, with a pivoted arm, then the TT needs to speed up with each rotation.

This means that the only playback system that is accurate in terms of speed is in fact a linear tracker.

Now...thoughts...
I agree with Chris and Dover, in my experience the ET should not be run downhill. Anything but perfect leveling of the arm causes image instability and balance problems at best, and in a worst case it causes severe distortion at the end of a record. The effects of the increased overhang adjustment have been relatively subtle, but definitely audible (beneficial in my case), and I would love to know in more detail what Brucen T meant when he said : "He's probably right". Some thoughts on leveling:
 
Maybe some would consider it masochism, but I have never been even close to experiencing enough frustration with setup of this arm to want to ditch it and go back to a pivoting. I have always tried to setup according to what my ears tell me sounds best, with the theory and "correct" approach taking somewhat of a back seat. As with most things in audio there is seldom only one parameter that needs to be considered at any one time; remembering that makes setup easier. For instance, balancing the tonearm (however we each do it) affects azimuth; so, it's important to remember that when we listen for the image stability effects of getting the balance stable. I use a small bubble level on the spidle itself, not the manifold housing. I find that this gets me in the ballpark, and then I use a procedure that I know will raise some eyebrows. I raise the cartridge using the cuing wand (not the lever) and very carefully "flip" the arm/cartridge up a tiny bit so that it actually bounces up and down unto the cuing wand. While this happens there is enough time for the entire arm to be suspended mid-air without the friction of the either the LP groove nor the cuing wand itself affecting the perceived movement to one side or the other. The arm will then "show" you wether it is truly level or not, as it will travel either inwardly or outwardly during those moments that it is suspended in air; one then mechanically adjusts accordingly. The procedure should be done with arm over the outer edge of the platter, the middle, and (if possible) the inner portion of the platter. I say "if possible" because as all you ET mavens know, the cuing mechanism is designed in such a way that the cartridge is usually closer to the record surface at the inside of a record vs the outside. It's tricky and potentially dangerous (to your cartridge), but I have yet to have an accident. One can always do it with the stylus guard in place, but that doesn't work for me since I like to setup the arm so that there is little clearance between the LP and the stylus "at rest".

Then there is the issue of the dressing of the tonearm wires and their influence on perceived "balance" of the tonearm. Aside from the superior sonics, that was one of the reasons I chose AudioNote wire for my wire loom. It is extremely thin and adds little drag to the arms movement. As an experiment I performed the above-described balancing procedure with the wire loom removed, and even in spite of meticulous dressing of the extremely fine wires, it was obvious that the wires will necessarily affect the perceived "balance" of the arm, and should be compensated for when mechanically balancing. In the case of my wire loom and how I was dressing it, it was introducing a slight force to the outside of the record.

Many users have complained that the ET "goes out of adjustment" over time. That has not been my experience. After years of experiencing this "problem", I finally realized that what was happening was that since I have the table on a wall mounted shelf, the seasonal shifting of the walls and floor of my house (110 yr old Victorian) was what caused the problem, not the arm itself. I suspect that many of the reported problems are caused by this.

Long live the ET2! :-)
Frogman, I have been thinking of trying that AN tonearm wire. Do you use it in a long uninterrupted run from cartridge to phono stage, or in a short run to a connector block on the tonearm? The AN wire is lighter gauge than the screened silver wire that I currently use from cartridge to phono stage. In a four-wire balanced arrangement this screened silver wire has excellent noise rejection, but must be dressed very carefully(perhaps impossibly so) to avoid interference with free movement of the arm wand. This wire has 4 ohm resistance over a 160 cm span. Any idea what resistance the AN wire presents per foot or meter?
Dover
Ct0517 - I would not run an ET downhill, but I get the overhang argument.

Dover – oh I get it. But I will also admit I have never experimented with making the ET2 armtube go past or stop short of the target point. I did not feel a need to because of the design. I felt I would be compromising it. Add it to the audio bucket list.

Pivot arms are different though – I have experimented because of the design and gone outside of protractor lines. I am in agreement with what Geoch said in my earlier post where I linked his contribution to an alignment thread.

Dover

NOW HERE IS ANOTHER POSER to ponder :
With a pivoted arm we have an overhang. The pivot arm/stylus tip moves in an arc, which means that for every 1.8 seconds ( 1 rotation ) the stylus tip has actually moved slightly forward with each rotation.

Put another way if you put the stylus tip in the first groove, and draw a tangent to the spindle centre, then with each rotation the stylus tip will move further ahead from that tangent.

This means that to achieve the correct playback speed, with a pivoted arm, then the TT needs to speed up with each rotation.

Well this IS very interesting. Again I have never considered this with my pivot arms. A changing variable with every rotation. Hmm…...Let me think about it.. Hopefully the pivot arm “devotees” here can chime in ?

Dover I am starting to wonder how many more of these “NOW HERE IS ANOTHER POSER to ponder” posts you have lined up for us to consider ?
Dear Chris, I'm on vacations and I can only use my mobile to respond.
So :
I agree with what Dover said.
We have to accept this fact but we must also note and realize that :
For an overhang of 17mm at the full side of an LP (22min=1320sec=733rotations) the displacement per rotation is 0.0232mm.
This particular kind of progressive speed break that takes place, it is just impossible to perceived by our senses as speed variation or pitch instability, but of course we can clearly witness a unique phenomenon of a flowing without friction that results only from the allways perfect tangential TRACE and this is the part of interest, not the effect of the perfect SPEED.
Now, to be able to take any advantage of this quality, one has to take care a number of concerns that perhaps this thread brings over, (I'm sorry it is impossible to read the whole thread on my ancient mobile phone) but one of the most curious that I've witness is the cartridge great VTF, great actual physical weight and relatively low catilever's compliance. I don't know if your experiments with MM carts brings forth any issues reg. all of the above, but my own living with Piere Lurnee SL5 & Goldmund T4 with MC's was reflecting this preference. I know these were 2 bad examples of Tangential arms but this is my limited experience and this is also the reason that I abandoned the Parallel tracking chapter. I've allways had lusting over an Air Tangent but the cost of purchase was 13000 euro five years back and lefts me wanting. I'm sorry but I can't be of any help here and somehow I feel that I'm embarrassing your findings with my own contradictions. It is just a different path that I take here, (as with my speakers, my DHT line pre & SET/OTL power amps) and although not clearly a preferance for pivoted over tangential, my favorite cartridges direct me this path .

About the alignment post on Pivoted arms:
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1343550512&openfrom&21&4#21
Take care