I always start by obtaining the manufacturer's Datasheet for the transistor.
NEC 2SC2785 Datasheet : NPN Silicon Epitaxial Planar Transistor for Switching and AF amplifier applications.
http://www.classiccmp.org/rtellason/...ta/2sc2785.pdfBased on the NEC Datasheet, their are 6 different
hFE
2 -- DC Current Gain ranges.
Bluecolour.net (China)
The transistor is subdivided into four groups, O, Y, G and L, according to its DC current gain.
http://www.bluecolour.net/script/pro...1240426773.pdf