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In page Crwth:

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While Jones's report was widely read and used as the basis of a number of subsequent accounts, and therefore today is often considered to be evidence of a standard tuning, it is more likely that a variety of tunings were experimented with and in some cases employed, as was and still is the case with many other string instruments, particularly those within folk cultures. A second tuning, reported by William Bingley (A Tour Round North Wales; London: 1800), features the drones tuned in octaves, with the strings over the fingerboard tuned in paired fifths rather than seconds. However this tuning is almost certainly derived from later violin playing and is impractical given that the crwth is equipped with a flat bridge and therefore designed to play all six strings simultaneously.