RE: It isn't "Stevenson" either!

Posted by flood2 (A) on May 2, 2021 at 18:58:58

In Reply to: RE: It isn't "Stevenson" either! posted by slider on May 2, 2021 at 17:15:06:

I am not sure what you mean about Stevenson "DIN" since the DIN modulation envelope technically spans from 57.5mm to 146.3mm, although it sounds like you are referring to Stevenson 1C as the nearest match. Whilst it might seem pedantic of me, you will see from the link, that although the overhang and offset are similar, the resultant arcs are very different.

Most people are actually referring to 1B when talking about a Stevenson alignment.
It is a common misconception that is repeated over and over that Stevenson is an "alignment" where you put the inner null at the minimum radius for whatever envelope you choose. If you read the Stevenson paper, he does not specify the inner null at the minimum radius - he applies the standard Lofgren equations to generate 3 variants for a Universal solution suitable for the three main record sizes based on the following modulation envelopes:
For a 215mm pivot/spindle distance and applying Lofgren A equations to the following modulation envelopes (converted from the values in the Table given in inches in the paper), you get the corresponding overhang (H) and offset (O) rounded to 1dp.
1A: (57.89 -> 145.26mm) H=16.9, O=23.2
1B: (54.81 -> 145.26mm) H=15.8, O=22.6
1C: (51.77 -> 145.26mm) H=14.8 (14.76), O=22.0 (21.99)

Technics: (53.47 -> 140.6mm) H=15, O=22

Anyway, I have created a link to the VE calculator to show how different the resultant geometries are to the Technics alignment. There will be some errors in the calculations due to rounding for the length conversions from imperial to SI.
Regards Anthony

"Beauty is Truth, Truth Beauty.." Keats

https://www.vinylengine.com/tonearm_alignment_calculator_pro (Open in New Window)

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Follow Ups Full Thread

Topic - Phono stage for my Technics SL -1500 C - bob24 10:05:58 04/29/21 (28)

RE: Phono stage for my Technics SL -1500 C - rrsands 05:03:31 05/04/21 (1)

RE: Phono stage for my Technics SL -1500 C - Don Reid 10:16:49 09/25/21 (0)

RE: Phono stage for my Technics SL -1500 C - BCR 15:59:40 04/29/21 (5)

In the "around $2k region. it's tough to beat the EAR 834P. - Opus 33 1/3 03:39:00 05/02/21 (4)

I remember when it was $750 (nt) - Dave Pogue 10:32:32 05/02/21 (1)

Yeah, but you're older than dirt, Dave. ;^) /nt\ - Opus 33 1/3 16:32:01 05/02/21 (0)

RE: In the "around $2k region. it's tough to beat the EAR 834P. - bob24 10:04:05 05/02/21 (1)

The MC section of the MM/MC model is not so great, but the MM only model is a winner. /nt\ - Opus 33 1/3 14:53:43 05/02/21 (0)

RE: Phono stage for my Technics SL -1500 C - afro18 13:33:44 04/29/21 (13)

RE: Phono stage for my Technics SL -1500 C - bob24 14:45:15 04/29/21 (12)

RE: Phono stage for my Technics SL -1500 C - volunteer 05:52:53 04/30/21 (10)

RE: Phono stage for my Technics SL -1500 C - bob24 10:49:53 04/30/21 (9)

At the risk of being attacked, using the plastic, Technics, overhang - alaskahiatt 15:03:39 04/30/21 (8)

+1 - Phil_S 18:42:51 04/30/21 (7)

Technics gauge is for Stevenson, not Baerwald... - slider 21:27:55 04/30/21 (6)

It isn't "Stevenson" either! - flood2 17:12:51 05/01/21 (3)

RE: It isn't "Stevenson" either! - slider 17:15:06 05/02/21 (2)

RE: It isn't "Stevenson" either! - flood2 18:58:58 05/02/21 (1)

RE: It isn't "Stevenson" either! - slider 08:08:43 05/03/21 (0)

RE: Technics gauge is for Stevenson, not Baerwald... - Phil_S 04:12:29 05/01/21 (1)

RE: Technics gauge is for Stevenson, not Baerwald... - flood2 17:26:33 05/01/21 (0)

The cuing mechanism should hold - Phil_S 17:38:35 04/29/21 (0)

Let's step back for a moment... - Phil_S 13:03:23 04/29/21 (3)

RE: Let's step back for a moment... - bob24 13:17:02 04/29/21 (2)

RE: Let's step back for a moment... - Phil_S 17:40:56 04/29/21 (1)

RE: Let's step back for a moment... - bob24 18:31:26 04/29/21 (0)

RE: Phono stage for my Technics SL -1500 C - Don Reid 10:20:54 04/29/21 (1)

RE: Phono stage for my Technics SL -1500 C - bob24 10:35:08 04/29/21 (0)

Follow Ups

RE: It isn't "Stevenson" either! - flood2 18:58:58 05/02/21 (1)

RE: It isn't "Stevenson" either! - slider 08:08:43 05/03/21 (0)

RE: It isn't "Stevenson" either!

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