A7♭5 8-string guitar chord

How to play A7♭5 on 8-string guitar

The most common way, the first shape above: your index finger on the D string at the 1st fret and your middle finger on the high B string at the 2nd fret. Let the A and G strings ring open. Don’t play the F♯, low B, low E and high E strings.

From the F♯ string x x x 0 1 0 2 x (x: not played, 0: open)

What notes are in A7♭5?

A7♭5, A dominant seventh flat five, is A, C♯, E♭ and G: the root (A), the major third (C♯), the diminished fifth (E♭) and the minor seventh (G). Its formula is 1 3 ♭5 ♭7.