The SHADOWS, 60s guitar group from the U.K., had the greatest influence on many of the groups in Singapore. Apparently the VOX - AC-30 amplifier and the Fender Stratocaster guitar is the dream team for many would be band enthusiasts. It is the most lethal combination to be heard when groups played on stage.
Many groups were not able to buy this expensive combination and tried to get away with cheaper versions but Singapore's guitar group competitions, so common those days, held many to ransom. Since talent contests were also talent spotting by recording companies many groups took them seriously. Some groups managed to buy these expensive instruments, otherwise they would not have seen the light of day let alone the lights on stage.
There were other guitar/amplifier combinations and many of them were just as good. Are you familiar with the instruments the groups used then?
YouTube: Key in: shadows apache