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1: Stupid me .... (3.17)
Posted by Klaus from NL on 1999-11-01, 08:05:52 (212.206.88.5)
You're perfectly right. Relative groove speed. But then, why is the same 300 Hz track on three different radii of the record ? Your options : 1) I've read on some occasions that the arm influences the .......
2: Re: Cartridge setup, Thanks to all (I think) (3.17)
Posted by Klaus on 1999-11-12, 01:23:28 (195.232.11.118)
I've got a brandnew 309 with all tools and the SME protractor. The SME protractor shows the outlines of the arm + headshell which have visually to be aligned with the arm outlines when viewed from abo .......
3: Re: Your reca problem (3.54)
Posted by Klaus on 1999-12-16, 02:06:36 (212.206.88.5)
You remember the question you had w.r.t. tracking performance of your Reca ? Maybe that pivot ring is the cause. Maybe the answer is somewhere within the following : 1. Antiskating : cf. www.audioasyl .......
4: Re: Arm setup and optimum tracking (2.59)
Posted by Klaus on 2000-01-07, 01:53:04 (212.206.88.5)
As I explained, for a given effective tone arm length the (Baerwald's) equations give optimum values for offset angle, overhang, mounting center distance. For an inner groove radius of 2.375 inch (60. .......
5: Re: Arm geometry questions (for the reviewers and others) (3.45)
Posted by Klaus on 2000-01-07, 02:04:01 (212.206.88.5)
>I assume that would be Baerwald's work that you're >referring to. If so why should tonearms for LPs be >judged by a formula that uses null points for 78s? Yes, it is Baerwald's analysis. But since it .......
6: Re: Arm geometry questions (for the reviewers and others) (5.01)
Posted by Klaus on 2000-01-07, 07:32:10 (212.206.88.5)
>I haven't seen the actual formula but I understand that Baerwald (and others who have done similar work) must make some assumptions about where the two null points will be. In fact, it's more than an .......
7: Baerwald's paper on arm geometry (5.28)
Posted by Klaus on 2000-01-10, 06:18:44 (212.206.88.5)
Baerwald's equations are obtained without regarding record size and speed. The first part of his paper deals with tracking error and results in the formula for weighted tracking error (deg/groove radi .......
8: Re: Baerwald's paper on arm geometry (4.55)
Posted by Klaus on 2000-01-10, 07:52:39 (212.206.88.5)
1. Baerwald is referring to a Loefgren paper of 1938 entitled : on the non-linear distortion in the reproduction of phonograph records caused by angular deviation of the pick-up arm. He states that th .......
9: Re: Question for Klaus (5.78)
Posted by Klaus on 2000-01-10, 23:21:09 (212.206.88.5)
When you have a tone arm on a TT that plays 33.3, 45 and 78 rpm, the arm designer necessarily must go a compromise way. LPs and 78s are of the same dimensions with the inner recorded radius being of s .......
10: Re: Dennesen soundtractor (2.79)
Posted by Klaus on 2000-01-11, 00:53:52 (212.206.88.5)
Dennesen's tool is based on Baerwald's equations. It allows you to check setup of your arm. When I checked on my former Dual CS5000, the setup with pre-installed Ortofon was perfect. US patent 4295277 .......
11: Re: Thoughts on cartridge alignment? (3.66)
Posted by Klaus on 2000-01-16, 23:43:03 (212.206.88.5)
Dennesen and Geodisc are based on Baerwald's analysis of arm geometry, which analyis results in equations for optimum setup in order to minimize distortions due to tracking error. Dennesen uses the ve .......
12: Re: Guidance sought on how to mount a tonearm without a manufacturer's template! (3.82)
Posted by Klaus on 2000-02-23, 02:46:55 (212.206.88.5)
For a given effective arm length there is only one (if one accepts Baerwald's analysis as given standard) set of optimum values for mounting distance, overhang and offset angle (all values being based .......
13: Re: Overhang conundrum - Project 1.2 (2.83)
Posted by Klaus on 2000-02-25, 02:27:21 (212.206.88.5)
Overhang, mounting distance and offset angle all depend on the effective arm length (which length you should try to ask for with project). BUT, input parameter for all this is the recorded inner groov .......
14: Re: Breuer type 8 Tonearm..... (2.58)
Posted by Klaus on 2000-04-04, 05:20:43 (212.206.88.5)
There is a review at www.monomedia.de/download/avance.pdf which is about a Brinkmann table with the Breuer 8 arm, saying that the arm is still sold but only in black. The Breuer 5A arm having incorrec .......
15: Re: Cartridge alignment protractors (4.09)
Posted by Klaus on 2000-04-04, 06:42:34 (212.206.88.5)
There are basically three correct geometrical considerations : Baerwald, Löfgren B, Stevenson (I'll come back on this in a future posting). Correct geometry involves effective arm length, overhang, of .......
16: Tone arm geometry : the final act (9.09)
Posted by Klaus on 2000-04-05, 06:05:38 (212.211.6.105)
Thanks to a paper I received from an AA fellow, I was able to write this, hopefully last, posting on arm geometry, that should answer any question one may have on this topic. The following key papers .......
17: Re: What is a good tone arm ? (12.48)
Posted by Klaus on 2000-04-10, 03:11:30 (212.206.88.5)
1. optimum geometry 2. low friction, low play bearings 3. good damping performance People tend not to consider no.1, which is a mistake, since wrong arm geometry inevitabley introduces distortion of s .......
18: Re: I dunno, Steven... (3.10)
Posted by Klaus on 2000-04-14, 05:10:04 (212.206.88.5)
I don't know if Steven has developped a new mathematical approach to that tracking error problem. If this was the case, he should publish his findings and results. I did not go into the maths of Baerw .......
19: Re: I dunno, Steven... (14.76)
Posted by Klaus on 2000-04-14, 06:47:44 (212.206.88.5)
Currently my 309 is set with the SME protactor. I further have the Dennesen soundtractor, which uses Baerwald geometry based on an inner recorded groove radius of 60.325 mm. Baerwald's approach was in .......
20: Re: Wheaton (13.84)
Posted by Klaus on 2000-05-16, 23:42:43 (212.206.88.5)
The only thing I know about the Wheaton is that it has Baerwald geometry, which is how it should be. Read also http://www.AudioAsylum.com/audio/vinyl/messages/20558.html Klaus .......
21: Re: Adjusting the SME 3009 Series III (4.70)
Posted by Klaus on 2000-05-25, 00:06:53 (212.206.88.5)
From someone who owns the 3009 III I learned that that upgraded CA-1 arm has Baerwald geometry, that is, null points at 66.04 and 120.9 mm radius, based on an inner recorded groove radius of 60.325 mm .......
22: Re: Best cure for an overhang (4.20)
Posted by Klaus on 2000-07-07, 06:02:19 (212.211.91.27)
Correct overhang is solely dependant on the tone arm's effective length. The so often cited Baerwald established in 1941 equations for minimum tracking error and subsequent mimimum distortion. For eac .......
23: Re: Tangency and minimum tracking error in (non- linear tracking) TT's (4.83)
Posted by Klaus on 2000-07-11, 10:05:46 (212.211.90.8)
This issue has been discussed in the past several times. Most modern arm (SME, Rega, Linn, Graham, Wheaton, Kuzma) use Baerwald geometry with null error at 66.04 and 120.9 mm radius for 60.325 mm inne .......
24: Re: 2 null point cartridge alignment (5.83)
Posted by Klaus on 2000-07-15, 07:16:27 (195.232.111.96)
In 1941 Baerwald has published his widely used (by arm designers : SME, Graham, Wheaton, Linn, Rega, Kuzma) analysis of tone arm geometry, which had the aim to provide the basis for minimum tracking e .......
25: Re: Cartridge problems (6.95)
Posted by Klaus on 2000-07-20, 01:33:34 (195.232.54.48)
Incoorect overhang is responsible for a certain amount of distortion (mainly 2nd harmonic) and not for the one-channel clicks and pops you have described. Thanks to its accessory tools, the Graham can .......
26: Re: Rega turntable protractor (2.99)
Posted by Klaus on 2000-07-23, 01:38:39 (195.232.111.69)
Let me post again what I posted some time ago concerning the issue of tone arm geometry : *********************************** The following papers on tone arm geometry are known : 1. Löfgren On the no .......
27: Re: Yes (13.65)
Posted by Klaus on 2000-08-07, 08:09:39 (212.206.88.5)
We had it extensively in the past, the geometry issue. Read here : http://www.AudioAsylum.com/audio/vinyl/messages/20558.html For optimum geometry as understands it Baerwald, you need particular value .......
28: Re: Yes (10.67)
Posted by Klaus on 2000-08-07, 23:33:38 (212.206.88.5)
Effective length is the pivot to stylus distance. If you take the 211 mm figure you obtain 19.839 mm overhang and 26.287 degrees offset angle. For the 229 mm figure you obtain 18.139 mm and 24.083 deg .......
29: Re: Protractors: dazed and confused (3.24)
Posted by Klaus on 2000-08-08, 00:51:58 (212.206.88.5)
Your description of how you set up the system seems ok, except the skewed cantilever. It's the cantilever that has to be tangent to the groove in the null points (assuming that the diamond is mounted .......
30: Re: What does incorrect overhang do? (3.54)
Posted by Klaus on 2000-08-21, 05:49:38 (212.206.88.5)
Incorrect overhang affects sound in general by generating harmonic distortion (thus artefacts which are not recorded) of mostly 2nd order and some 3rd order. Overhang is depending on two parameters : .......
31: Re: Dual CS 5000 OK for Shure V15? (2.87)
Posted by Klaus on 2000-08-23, 05:29:17 (212.206.88.5)
I had one which I sold last year for HFL 250. It came with an Ortofon OMB 20 (compliance 35), no problems with resonance. The arm is designed using the Baerwald approach (minimum overall tracking dist .......
32: Re: Did a Search - Need More Info on Tonearm (5.89)
Posted by Klaus on 2000-08-31, 03:54:31 (212.206.88.5)
Magnepan has a patent application on a tone arm : GB 2022905. Goto the link below and have a look. The geometry of the Magnepan Arm is very close to Baerwald's optimum geometry which means that the gu .......
33: Re: Another somewhat related question about the HFN&RR Test LP (4.14)
Posted by Klaus on 2000-09-01, 01:12:50 (212.206.88.5)
Tracking distortion is depending directly on tracking error and inversely depending on groove radius. For the tracking error dependancy, I would have to look in the Baerwald paper. Distortion is great .......
34: Re: Armboard to spindle distance (5.77)
Posted by Klaus on 2000-09-06, 22:58:55 (212.206.88.5)
Helge, I'm busy exploring literature about arm geometry and tracking distortion, having made my way through Baerwald's paper so far (a post on that will follow). Effective length is not something tha .......
35: Re: Help! Armboard to spindle distance needed (2.74)
Posted by Klaus on 2000-09-07, 01:41:07 (212.206.88.5)
In Audio Magazine's annual equipment directory the MAX237 effective length is indicated with 9.3 inches (=236.22 mm). Optimum values for 236 mm length are overhang : 17.557 mm offset angle : 23.325 mm .......
36: Re : reply to Helge and Traddles (3.03)
Posted by Klaus on 2000-09-10, 23:46:50 (212.206.88.5)
Every arm has its own unique combination of effective length, overhang (mounting distance) and offset angle for obtaining optimum tracking geometry (for a selected mathematical approach). You can meas .......
37: Dustcover closed or open ? (9.98)
Posted by Klaus on 2000-09-11, 02:35:58 (212.206.88.5)
Found another reason in literature for closing while spinning, maybe it's worth a consideration : Wilson, record contamination: causes and cure, JAES 1965, p.166 "Set a record rotating at 33 rpm on a .......
38: Re: Stylus alignment tool (2.04)
Posted by Klaus on 2000-09-14, 02:26:26 (212.206.88.5)
You should not use an alignment tool that is based on a geometric approach different from that used for the tone arm's design. The reason is that the vertical bearing axis of the arm should be perpend .......
39: Re: Geometrical approaches (3.25)
Posted by Klaus on 2000-09-15, 04:38:30 (212.206.88.5)
Helge, the intended offset angle of the design of the arm is indeed the angle as you describe it in the text following in brackets. Once again, you cannot simply measure that angle after having instal .......
40: Vertical bearing alignment (12.75)
Posted by Klaus on 2000-09-19, 23:19:56 (212.206.88.5)
Another parameter, independent of and yet linked to arm geometry, is the orientation of the vertical arm bearings (those that allow up-and-down movement of the arm). Many arms allow for adjustment of .......
41: Re: Different radii ? (3.56)
Posted by Klaus on 2000-09-21, 22:45:20 (212.206.88.5)
I suspect a different inner recorded groove radius to be the reason. Since the 309 is the youngest arm of the family, I would suppose that they still used Baerwald math, but another radius. Maybe that .......
42: Re: Cartridge Alignment Positions (4.27)
Posted by Klaus on 2000-09-21, 22:52:49 (212.206.88.5)
66.04 and 120.9 mm are the so called Baerwald null radii, based on 146.05 and 60.325 mm outer and inner recorded groove radius and for single purpose arms (one rpm, one record size). Baerwald math res .......
43: Re: Different radii? (8.09)
Posted by Klaus on 2000-09-22, 01:54:07 (212.206.88.5)
Thanks for having directed me to those old threads. I'm actually corrsponding via e-mail with that guy. He's probably right but when checking by means of Baerwald's equations I did not get consistent .......
44: Re: There is no ONE correct position ... YES there is! (4.59)
Posted by Klaus on 2000-09-25, 03:19:45 (212.206.88.5)
One is free to choose Baerwald or Löfgren math or any other, since all methods known from literature are correct (says Dennes). But either method needs recorded groove diameters as input parameter. Th .......
45: Re: Sure sounds right... (12.05)
Posted by Klaus on 2000-09-26, 04:56:54 (212.206.88.5)
For determining optimum overhang, offset angle and null points for a given effective length you take one of the mathematical approaches, e.g. Baerwald, then select inner and outer recorded radius and .......
46: Baerwald's analytic treatment of tracking error (4.02)
Posted by Klaus on 2000-09-28, 02:52:34 (212.206.88.5)
Anyone interested in having a copy of that infamous 1941 paper ? I'm going to copy it for some other people and the copy machine doesn't mind copying x times instead of 3. No scanning is possible for .......
47: Re: A geometrical puzzle (4.40)
Posted by Klaus on 2000-09-29, 07:01:26 (212.211.64.15)
Do I see big clouds of smoke coming from Oslo across the baltic sea towards continental Europe ??? Must be someone up there brainstorming on geometry... What you can do is measure the null radii and c .......
48: Re : Limitations of the HFNRR bias test (2.43)
Posted by Klaus on 2000-10-02, 04:20:14 (212.206.88.5)
For the nature of skating force, see here : http://www.AudioAsylum.com/audio/vinyl/messages/10752.html You can see that only on two points on the record a particular antiskating value will cross that .......
49: Re: Tonearm geomtry basics (2.66)
Posted by Klaus on 2000-10-04, 00:10:57 (212.206.88.5)
Some two weeks ago I proposed to send a copy of Baerwald's "analytic treatment of tracking error and notes on optimal pickup design" to those interested. One of those who replied has the intention to .......
50: Re: tonearm geometry (6.29)
Posted by Klaus on 2000-10-04, 02:00:30 (212.206.88.5)
If it's the Dennesen soundtractor (the name is written on the plate), it's the best for Baerwald geometry (in terms of use). If you don't wanna use it, I'll buy it (mine is only a copy). Properly desi .......
51: Re: Good job, Helge (3.19)
Posted by Klaus on 2000-10-04, 02:39:51 (212.206.88.5)
Some comments : >There are basically two approaches to this: What is known as Baerwald's approach is to make the tracking error largest at the beginning of the record, while each of the other two maxi .......
52: Re: One small point (6.69)
Posted by Klaus on 2000-10-04, 23:36:52 (212.206.88.5)
I would say that the axis in question is actually the longitudinal axis of the headshell which, in ideal case, is aligned with the cantilever. Concerning your previous reply, B. calculation were based .......
53: Re: Löfgren (8.22)
Posted by Klaus on 2000-10-05, 03:15:16 (212.206.88.5)
The Löfgren paper Dennes is referring to in his letters to the editor of Audio and Wireless World (this is the only trace we have by now) is the one I have. Löfgren actually wrote an earlier paper in .......
54: Re: Löfgren (9.75)
Posted by Klaus on 2000-10-06, 00:22:21 (212.206.88.5)
Well, L. did essentially the same as B., but less straightforward, so that his paper is more difficult to read. Furthermore he introduced another variable, which reads like linear offset P, and anothe .......
55: Re: A Geometrical Puzzle by Helge Gundersen Revisitted (12.41)
Posted by Klaus on 2000-10-14, 00:56:03 (212.211.68.17)
>For a given platter spindle to tonearm pivot distance, selecting a pair of null radii uniquely defines an arm effective length and offset angle.> Not quite true, if I understood the math correctly. T .......
56: Re: A Geometrical Puzzle by Helge Gundersen Revisitted (3.08)
Posted by Klaus on 2000-10-16, 02:53:06 (212.206.88.5)
Baerwald's equations are such that maximum weighted tracking error occurs at inner, outer and some intermediate radius. He does not refer to any particular radius that must be (well, he does refer to .......
57: Re: Null points formula (5.90)
Posted by Klaus on 2000-10-17, 23:12:25 (212.206.88.5)
Here it is : r = 2 x R1 x R2 / (a+b) R1 = inner recorded radius R2 = outer recorded radius a = (1 ±* 1/sqrt2) x R2 (±* = minus plus) b = (1 ± 1/sqrt2) x R1 (± = plus minus) Practically all records hav .......
58: Re: Case Study question. (6.98)
Posted by Klaus on 2000-10-18, 06:33:30 (195.232.106.101)
1. rega data were forwarded to me upon a corresponding question in deja.com. I obviously can not check them, so you perhaps should check with rega themselves (or someone else who has precise 250 data) .......
59: Re: Thanks. Is HFN&RR protractor based on Baerwald? (nt) (11.50)
Posted by Klaus on 2000-10-19, 00:39:02 (212.206.88.5)
The null points at 66 and 121 mm would indicate that, but to be absolutely certain one would have to ask the tool's designer. Klaus .......
60: Re: Cartridge alignment (4.79)
Posted by Klaus on 2000-10-19, 01:05:45 (212.206.88.5)
For arms having standard Baerwald geometry (look in recent thread for more info about that) the best tools are the Dennesen Soundtractor, the Geodisc, the Wally tractor. Dennesen : US patent 4,295,277 .......
61: Re: Whats the overhang supposed to be for RB250 .... 16mm? Also, how does one measure overhang? (2.95)
Posted by Klaus on 2000-11-07, 23:32:03 (212.206.88.5)
>It seems that the grid is placed a distance of 60.3mm from the spindle, so this will not give alignment according to Baerwald's method or Logfren's method. Stevenson has proposed such an alignment in .......
62: Re: Stevenson (10.60)
Posted by Klaus on 2000-11-08, 02:55:11 (212.206.88.5)
I need to have a look at his paper. I'll post the answer on a later moment. For the time being, refer to the link. Klaus Dennes .......
63: Re: Stevenson (14.28)
Posted by Klaus on 2000-11-08, 06:17:14 (195.232.107.158)
Stevenson argues that most forms of distortion increase as the stylus approaches the turntable center, so that it would be desirable for tracking distortion to be very small at the average minimum val .......
64: Re: Gyro & Orbe Tonearm Choices (8.41)
Posted by Klaus on 2000-11-12, 23:20:56 (212.206.88.5)
I've got the 309 on my Gyro. The V is slightly better in terms of damping and arm tube resonance behaviour, but more expensive. It does not have azimuth adjustment possibility, but has the dynamic (sp .......
65: Re: Mono LP Playback - Miss-tracking On Loud Passages (3.52)
Posted by Klaus on 2000-11-27, 02:05:17 (212.206.88.5)
As long as it's stereo grooves, no problem with groove width and stylus bottoming. BUT, mono means lateral modulations only so that you have full enjoyment of tracking distortion, which is greater tha .......
66: Re: Question to J. Carr and other experts (3.27)
Posted by Klaus on 2000-11-27, 23:34:22 (212.206.88.5)
Jonathan, thank you for having taken the time to post that extensive reply. >However, modern high-quality Japanese line-contact styli like Namiki's MicroLine (microridge)... Can one assume that whene .......
67: Re: What *tool* would this be ???..................[nt] (2.19)
Posted by Klaus on 2000-11-28, 22:43:55 (212.206.88.5)
It's a two point custom made protractor he sent me after me sending him the Baerwald paper. That tool would allow to put a lot of grids on it, such as Baerwald standard, Baerwald customized, Löfgren B .......
68: Tone arm geometry and tracking distortion (longish) (8.21)
Posted by Klaus on 2000-12-04, 08:26:10 (212.206.88.5)
1. Baerwald's analysis : Distortion due to lateral tracking error affects only the laterally cut modulation of the V-shaped groove, not the vertical signal (which are affected by vertical tracking err .......
69: Re: What about the null points? / How the thing works (5.64)
Posted by Klaus on 2000-12-05, 05:28:31 (212.206.88.5)
>Löfgren B is supposed to have different (closer-spaced) null points, but the Wallytractor has only the Baerwald null points, the Löfgren option consisting in an increase in overhang at those null poi .......
70: Re: SME 3009 (7.71)
Posted by Klaus on 2000-12-06, 04:06:58 (212.206.88.5)
If you decide to go for a 3009, take care to ensure that it has an armwand with Baerwald geometry. Apparently some older 3009 versions have geometry way off optimum. Having realized that (Audio Critic .......
71: Re: Not what, but who (3.24)
Posted by Klaus on 2000-12-06, 22:50:34 (212.206.88.5)
H.G. Baerwald was a clever guy from The Brush Development Co., Cleveland, Ohio. He went the adventure route into how to get optimum tone arm geometry, only to find that his paper would be forgotten fo .......
72: Re: An easier solution :-) (4.15)
Posted by Klaus on 2000-12-13, 22:35:07 (212.206.88.5)
Maybe a bit more expensive : SHIFTING BETWEEN BAERWALD AND LÖFGREN OVERHANG VALUES The SpJ arm has been set-up in accordance with the Baerwald overhang values. It is possible to shift to the Löfgren v .......
73: Re: All the credit should go to Wally Malewicz who figured this out for the Wallytractor, not me!(nt) (6.20)
Posted by Klaus on 2000-12-14, 00:40:34 (212.206.88.5)
Hi Garth, >So far I haven't seen a response to this error in the discussion. If you read Brian's essay carefully, you'll find the following passage : ******************** CASE 2 Changing from Baerwald .......
74: Turntables (2.70)
Posted by Klaus on 2001-01-02, 03:27:08 (212.206.88.5)
Happy New Year to all. On a list of turntables having some feature that makes them particularly interesting or outstanding, which ones would you put ? Some examples that came to my mind : Nakamichi Dr .......
75: Re: Schön Schablone (2.56)
Posted by Klaus on 2001-01-11, 05:32:52 (212.206.88.5)
This tool uses Baerwald math (which is widely accepted and also used by various arm manufacturers (SME, Graham, Kuzma, Linn, Wheaton)) and inner and outer recorded groove radii as specified in the cor .......
76: Re: Wallytractor Update & Loefgren vs. Baerwald (5.21)
Posted by Klaus on 2001-01-14, 23:42:32 (212.206.88.5)
First, cartridge alignment does not have an influence on surface noise but on distortion. For recorded groove radii of 146.05 and 60.325 mm Baerwald geometry places the null points at 66.04 and 120.9 .......
77: Re: So frustrated with mistracking ... (4.12)
Posted by Klaus on 2001-02-01, 05:09:22 (212.206.88.5)
A correctly aligned arm results in tracking error such that this is of no problem (distortion figures well below 1 per cent, with peak values of about 1 percent at the inner groove). Correct means sth .......
78: Re: Grado Sonata overhang? (5.99)
Posted by Klaus on 2001-02-09, 08:19:56 (212.206.88.5)
This problem is linked to the fact that Graham sets pivot-spindle distance first and then overhang (corresponding to that mounting distance) by means of the supplied jig. For cartridges with cantileve .......
79: Re: Is vinyl being killed? The choice: Blind faith or No nonsense. (3.09)
Posted by Klaus on 2001-03-06, 06:23:55 (212.206.88.5)
To begin with, there is no such thing as one single correct alignment. Just like for VTA, there is one single correct (or better optimum) alignment for each individual record. Why ? Baerwald, Löfgren .......
80: Re: Offset angle of tonearm headshells... (2.58)
Posted by Klaus on 2001-03-30, 04:09:40 (212.206.88.5)
The best way to learn is to go and read the source which can be found in the link. Baerwald's paper gives you only the geometrical background and the equations needed for optimizing geometry. Baerwald .......
81: Re: Rega arm distance, Klaus, give more info - single play (6.83)
Posted by Klaus on 2001-04-09, 06:19:03 (212.206.88.5)
You were asking : Given that the GEOdisc uses a different geometry, what would you say is the best relatively inexpensive tool (with the exception of the elusive Wallytractor) to use for aligning a Re .......
82: Re: Links on tonearm and turntable geometry (2.14)
Posted by Klaus on 2001-04-21, 03:40:44 (212.211.10.18)
These two links give you the necessary formula http://www.audioasylum.com/audio/vinyl/messages/62570.html and http://www.audioasylum.com/audio/vinyl/messages/62571.html Some of the papers referred to .......
83: Tonearm geometry papers on the web (7.61)
Posted by Klaus on 2001-04-23, 04:20:52 (212.206.88.5)
Two links : http://www.helices.org/auDio/turnTable http://www.analogue-domain.org.uk/armgeom.html/ The first has the papers of Löfgren, Baerwald, Stevenson, Bauer (thanks to mds for his efforts). The .......
84: How tracking distortion comes about (Helge) (8.41)
Posted by Klaus on 2001-05-07, 05:18:00 (212.206.88.5)
Hi Helge, tracking distortion is generated because the playback stylus does not describe a pure sinewave (as recorded) but a somewhat deformed wave resulting in frequency modulation of the recorded si .......
85: RE : alignment protractors (3.81)
Posted by Klaus on 2001-10-19, 06:55:13 (212.206.88.5)
The truth about protractors is that any of them, with the exception of the JMW's, will set the cartridge such that the resulting curve of distortion starts at a maximum (outer groove), falls down to z .......
86: Re: Geometry differences between Rega and turntablebasics.com protractors? (2.55)
Posted by Klaus on 2001-11-20, 07:29:59 (212.206.88.5)
The only way to know by how much different alignments differ (in terms of distortion) is to compute distortion diagrams. An Excel spreadsheet is available on the free stuff section of >www.enjoythemus .......
87: Re: Pickup Design (3.21)
Posted by Klaus on 2002-11-28, 02:46:31 (212.206.88.5)
I have the orginal Stevenson paper. I could send the missing page by telefax. Mail me off-board. The Löfgren paper is available only in German and Swedish (first publication). As for Löfgren's results .......
88: Re: Gargabe in - garbage out (4.63)
Posted by Klaus on 2003-04-01, 23:12:51 (212.206.88.6)
Well, a distortion-free source would be great, unfortunately this is not possible with vinyl. Example : you are adjusting your cartridge using a two-point protractor based on Baerwald geometry, null p .......
89: Re: It is pretty important, but how much ? (2.65)
Posted by Klaus on 2003-10-23, 05:26:29 (145.64.134.241)
1. Baerwald's null points at 66 and 121 mm are opimum only for records with 146.05 and 60.325 mm recorded radii. For all the other records of a collection you would have to compute the correct values .......
90: Re: It is pretty important, but how much ? (3.33)
Posted by Klaus on 2003-10-23, 07:33:18 (145.64.134.241)
The question is not 60 mm and less (or more), the question is 60 mm or not. Inner and outer recorded groove radii are the only variables in the equations for the two null points. Hence the 66 and 121 .......
91: Re: Well, No and Yes?!? (3.33)
Posted by Klaus on 2003-10-23, 07:47:29 (145.64.134.241)
>The world famous duo 66 and 121 mm are theoretically and practically universally compatible with ALL arm designs! Believe me. Yes and no. SME 309 for instance is designed for 58 mm inner groove radiu .......
92: Re: Cart alignment: why does it matter? (3.09)
Posted by KlausR. on 2005-01-28, 22:49:59 (83.84.178.102)
Actually, your Geodisc uses the same maths (and null points) as does the WallyTRactor, which is the solution proposed by Baerwald in 1941 (as published in the Journal of Society of Motion Pictures Eng .......
93: Löfgren's paper on cartridge alignment/tone arm geometry is now available in English (4.29)
Posted by KlausR. on 2008-11-26, 05:26:36 (94.209.134.127)
When talking about tone arm geometry and cartridge alignment, usually Baerwald's paper from 1941 is mentioned. However, Erik Löfgren was actually the first to publish the solution, identical to Baerwa .......
94: RE: Baerwald alignment (13.74)
Posted by KlausR. on 2009-01-26, 02:40:30 (145.64.134.224)
Hi Mark, as you will have read in my note accompanying the translation of Löfgren's paper into English, credit should be given to Löfgren, not Baerwald. I know that it has become a habit to mention B .......
95: Loefgren, Baerwald & Co. (8.86)
Posted by KlausR. on 2009-02-04, 06:31:48 (83.80.178.101)
Hi Seb, >yep, Lofgren did it first and without Graeme Dennes paper, most of us would still ignore this fact. Interestingly enough, Baerwald cited Loefgren, and Bauer, Seagrave, and Stevenson all cit .......
Found total of 95 records, Query: baerwald löfgren stevenson dennes, Author: Klaus in Vinyl Asylum, Time: 0 sec.