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I've tried searching but can't seem to determine a clear answer. I have seen John Elison's charts (thank you John!) but it appears Feickert mentions that proper alignment depends on when the record was produced.Can anyone refute this statement taken from the Feickert website?
"The major goal was to find a tracking geometry that suits LPs in a perfect way. Out of a 100 records we checked the inner and outer radii and found out that the IEC recommendations of 60,325 and 146,05 mm were matched well by the large majority of records determined. After Løfgren’s equations this results in 70,2 and 116,6 mm for the Null points and a linear offset of 93,445 mm.
Older records dated back in the late 50s and early 60s sometimes have recorded grooves at down to 56 mm! Taking this into account we have calculated a second set of parameters and printed another template on the backside. There you can also find a strobe to adjust 33 1/3 und 45 rpm with light of 50/100 Hz."
Follow Ups:
Hi,It is correct that determining the null radii depends on the choice of inner and outer groove radii.
In fact, the DIN standard allows modulated grooves to be cut to an inner groove radius of 57.5 mm and I have a handful of DG records with a 57.5 mm inner groove radius. However, as a percentage of my total collection this number is very small.
If you look through your record collection, you'll find that it is rare for the inner groove radius to fall even as low as 60.325 mm. Based on this, I've seem it argued that the inner groove radius should be chosen as some value greater than 60.325 mm in order to produce less 2nd order harmonic distortion on the majority of LPs.
Either argument has some validity, but the debate falls into the category of hair splitting.
Using 60.325 mm as the inner groove radius and 147.05 mm as the outer groove radius has the benefit of giving the well accepted standard null radii of 66.0 mm and 120.9 mm if you opt for an alignment to minimise the peak distortion between the inner and outer groove radii.
Best regards,
BK
I have been thinking about this myself.I believe that mastering decisions in relation to intended stylus playback angle are important.At one time some records were being cut at 15 degrees before the now generally accepted 20 degrees.So the upshot is the you can use the Baerwald alignment and mess around with your SRA to cover all options.
...to stray from VTA a bit...now that I have a cartridge that is affected by VTA, I have been playing around with it a bit.
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