It is known that the first string on the fifth fret is “la” of the first octave. I have repeatedly heard that in terms of frequency this sound roughly corresponds to the sound of a dial tone in the handset: “la” - 440 vibrations per second, a telephone dial tone - 400 vibrations per second. Maybe it is so. I myself have never tested it. The open first string is the "mi" of the first octave. You can tune it by tuning fork, piano or any other tuned musical instrument. And you can by ear.
If you can’t hear by ear, “la” or “mi” of the first octave, then God bless him. Tune the first string as you like. Subsequently, you will get used to the sound that suits you the most, and you will always tune your guitar equally along the first string.
So, setting the first string on the fifth fret, all the rest should be clamped also on the fifth fret, adjusting to the open previous one. The exception is the third string, which must be clamped on the fourth fret. That is, we pinch the second string on the fifth fret: it should sound in unison with the open one. Squeezed on the fourth fret, the third string should sound in unison with the open second. And so on…
The second way. Check
The described method is very inaccurate (if you, of course, not an absolute ear). Therefore, after setting, you can arrange yourself a small check. The third string on the ninth fret sounds the same as the first open one. The fourth on the ninth - as the second open. Fifth on the tenth - as the third open. The sixth in the tenth is like the fourth open. The first open and sixth open sounds like "mi" with a difference of two octaves.
The third way. Extraordinary
You can customize your guitar with flageolets. Flageolet is a doubled frequency sound. You can get it like this: by pulling the string, partially press it with a fingernail or a fingertip at the point of division of the frets (fretsail). The sound will be rattling.
So, check with flageoles: the first string on the seventh fret = second on the fifth, third on the seventh = fourth on the fifth, fourth on the seventh = fifth on the fifth, fifth on the seventh = sixth on the fifth. In other words: the sound with the first string slightly clamped on the nut between the seventh and eighth frets is equal to the same sound of the second string between the fifth and sixth frets.
The fourth method. Visual
If you tune your guitar for a while, it’s quite complicated (and this, believe me, is just a training issue), you can tune it to your eye: if the two strings are tuned in unison, then when you pull one, the second one starts to vibrate. Suppose you want to check the second string: to do this, hold the second string on the fifth fret, when extracting sound from it and if it is properly tuned, the first string will vibrate.
Well, and if even eyes are bad, buy a tuning fork - not such a ruinous purchase. A set of good strings is much more expensive.
Watch the video: Tuning a Guitar - Standard tuning for 6 string guitar (November 2019).