F♯dim7 7-string bass chord

How to play F♯dim7 on 7-string bass

The most common way, the first shape above: your middle finger on the A string at the 9th fret, your little finger on the D string at the 10th fret, your index finger on the G string at the 8th fret and your ring finger on the C string at the 9th fret. Don’t play the B, E and F strings.

From the B string x x 9 10 8 9 x (x: not played, 0: open)

What notes are in F♯dim7?

F♯dim7, F♯ diminished seventh, is F♯, A, C and E♭: the root (F♯), the minor third (A), the diminished fifth (C) and the diminished seventh (E♭). Its formula is 1 ♭3 ♭5 ♭♭7.

Why do four diminished seventh chords have the same notes?

A diminished seventh is minor thirds stacked all the way round, F♯, A, C and E♭, so F♯dim7 has the same notes as the diminished sevenths on A, C and E♭. Any of its notes can be the root.