The early 90's were a great time for So. Cal sports talk radio -- Hacksaw in his prime, Chet Forte (RIP) and Steve Hartman, and a pre-syndication Jim Rome.
....and the Chargers had a pretty good team.
XTRA-AM ("The Mighty 690") essentially "moved out" of SD and up to LA a few years ago and just last week reportedly had all its sports programming (Raiders, Clips, and Bruins) transferred to KLAC (570), so it will pretty much cease to be a factor in SoCal sports broadcasting. Hamilton apparently still has a show on XTRA, but I haven't listened for years. His "high speed newswire" (which could be timed by calendar at times) and other schtick turned me off a long time ago.
I should also note that XPRS-AM ("The Mighty 1090") replaced XTRA on SD sports radio and just announced that Ted Leitner("the man, the myth, the legend") will take over as announcer for SDSU football and hoops. Leitner already handles Padres games for 1090 along with Jerry Coleman, so it looks like it's "all Ted, all the time" for Padres baseball, SDSU, and sports-talk.