Much earlier. Professor Erik Löfgren of the Royal Institute of Technology in Stockholm, Sweden, developed and published the first tonearm alignment equations in 1938. Baerwald, Bauer, Stevenson and several others who came after Löfgren produced identical equations differing only in notation and...
L₂ = (L₁² + D² − 2L₁D cosγ)½ , Arm effective length with A-style SPU
α = arcsin (L₁ sinγ /L₂) , Arm offset angle with A-style SPU
L₁ = Arm effective length with G-style SPU
D = 21.5 mm difference between SPU-G and SPU-A mounting collar to stylus distance
γ = arm offset angle with G-style SPU...
The RMG-309 null points are 60.0/115.4. If you want to maintain these same null points then with the SPU-A, you should set your pivot-to-spindle distance at 287.6 mm. This gives an overhang of 11.8 mm.
This is the identical one I used to have long ago. To be precise, as shown on this spec sheet, it was a SD 900/E+ Super. After this cart I had another Supex - the SDX 1000. Not sure if it was also a Sugano design. It had a boron cantilever. The body was rounder and more petite. Anyone remember it?
If your platter has a recess for the record label then any weight much over a pound will lift the edge of the record noticeably. In which case you could benefit from an edge clamp.
The Telarc, despite its Soundstream origins, has arguably the best sound of any version on vinyl, along with a top class performance. The reissue by Craft Recordings is excellent though the original issue might be preferred by some. They’re very close.
These are great comments. Thank you. I especially found fascinating your experience with a power cord plugged into an outlet but unplugged at the IEC end. That situation exists currently in my system and I will do some experiments.
Also I just ordered a Hammond 171A isolation transformer to try...
Interesting thesis. This suggests that perhaps running the motor controller off of an isolation transformer could be useful to keep the nasties from infecting the rest of the system. And I have also observed that the effect is of the same magnitude as on a preamp.
Can anyone theorise why changing the power cord on a turntable motor controller can make such a dramatic difference in some cases, and is the effect the same for both AC and DC motors?
Ortofon Xpression cartridge in absolute mint condition. Less than 100 hours of use on RS-309D tonearm. Complete as new with box and accessories, including cute thumb drive containing document files. Can be used in place of any SPU cartridge without any adjustments other than tracking force...
I have issues #134 to #290, except #244 and #285. Need to clear for more space. Free for local pickup. My zip is 92024. Cannot be shipped via Media Mail since they contain advertising.
You should contact Joe Cohen about the Pranawire Lalit phono cable. It is the finest one I’ve heard among many over the years. I haven’t heard the latest Odin, but the Lalit handily beat a Valhalla 2. I think the last price I can remember seeing was $5K.