Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ.

---

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Vinyl Asylum ]

---

[ Alert Moderator ]

---

RE: Fidelity Research FR64S

Posted by John Elison (A) on June 30, 2020 at 12:47:27

In Reply to: RE: Fidelity Research FR64S posted by mulveling on June 30, 2020 at 11:10:31:

What do you mean by "Baerwald"? In other words, I'd like to know what you mean when you constantly use the terminology "Baerwald"? Are you referring to a specific set of null-points? If that's the case, any two null-points can be called Baerwald null-points simply by selecting the required modulated groove envelope. Below are Baerwald's equations, which calculate a pair of alignment null-points from a specific modulated groove envelope.

The FR-64S tonearm has the following parameters:

Effective Length: 245-mm
Mounting Distance: 230-mm
Offset Angle: 21.5-degrees
Inner Null-Point: 59.17-mm
Outer Null-Point: 120.4-mm

These are Baerwald null-points only for the following modulated groove envelope:

Innermost Modulated Groove Radius: 53.53-mm
Outermost Modulated Groove Radius: 153.27-mm

Normally we use the IEC modulated groove envelope defined by the following values:

Innermost Modulated Groove Radius: 60.325-mm
Outermost Modulated Groove Radius: 146.05-mm

Given the IEC values above, Baerwald null-points would be:

Inner Null-Point: 66.00-mm
Outer Null-Point: 120.89-mm

These require the following tonearm parameters based on effective length of 245-mm:

Effective Length: 245-mm
Mounting Distance: 228.14-mm
Offset Angle: 22.42-degrees
Inner Null-Point: 66.00-mm
Outer Null-Point: 120.89-mm

Another set of tonearm parameters based on a mounting distance of 231.5-mm are listed below:

Effective Length: 248.13-mm
Mounting Distance: 231.5-mm
Offset Angle: 22.12-degrees
Inner Null-Point: 66.00-mm
Outer Null-Point: 120.89-mm

Best regards,
John Elison

This post is made possible by the generous support of people like you and our sponsors:

Crux Audio

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---