I don’t think it has anything to do with temperament. Its very simple really. Take any scale mode, major, minor, Dorian etc. The 4th note in the scale is always 5 half steps from the tonic. The 5th note in the scale is always 7 half steps from the tonic. Always perfect. The other scale intervals will vary in the number of half steps. In the major scale the 3rd interval is 4 half steps. In the minor mode its 3 half steps. In the Dorian its 3 half steps.
Mandolin : Weber Bitterroot F, Gibson 1907 A, Eastman 805 A
Mandola : Weber Yellowstone A
Guitar : Taylor 810
Laurence
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