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C6th is the most popular tuning for lap steel, largely because of the ease of playing both major and minor chords. There is a lot of instructional material for this tuning, which was often called Am7 in older literature.
The John Pearse gauges feature a heavy plain G (.024), which matches tones nicely between the minor chord on strings 1, 2, 3, 5 (A minor) and the major chord on strings 1, 2, 4, 5, 6 (C major). Some people raise the low C to C# to include a 7th chord in the tuning (A7 on strings 3, 4, 5, 6).
1. E .015
2. C .017
3. A .020
4. G .024p
5. E .030w
6. C or C# .034