here are Risa's and
D'Addario's recommndations:
heavy gauge (about 20 lbs tension):
high g - .014"
low-G = 0.030" wound
C = 0.023" wound or 0.020" plain
E = 0.016" plain
A = 0.012" plain
light gauge (about 15 lbs tension):
high g = .012
low-G = 0.026" wound
C = 0.017" plain
E = 0.014" plain
A = 0.010" plain
A 0.018" for C is is okay. You can buy a standard electric guitar string
set 0.010" and take the first four strings of this set.
With kind regards
RISA Musical Instruments
And D'Addario's Recommendations:
Unit Weight Scale Length Frequency Gauge Tension
(Lb/in) (in) (Hz) (in) (Lb)
.00001601 19.00 466.20 A# = PL0085 13.00
.00001794 19.00 440.00 A = PL009 12.98
.00003190 19.00 329.60 E = PL012 12.95
.00004984 19.00 261.60 C = PL015 12.75
.00009184 19.00 196.00 G = NW022 13.18
.00001999 17.00 466.20 A# = PL0095 13.00
.00002215 17.00 440.00 A = PL010 12.83
.00004037 17.00 329.60 E = PL0125 13.12
.00006402 17.00 261.60 C = PL017 13.11
.00010857 17.00 196.00 G = NW024 12.48