I have fond memories of the old style Radio Shack from the old days as well. And also there was University Stereo. Old style electronics shops were more common back then, you know the ones you would see electrical techs and electrical engineers (like my dad) hanging out at...they had aisles of electrical components, and usually a HiFi area for DIY (there is only one of these still around that I am aware of in Fullerton, CA called ORVAC).
I wish I could remember Pacific Stereo a little better. But, it is the Fred R. Rated ads that stood out for me.
Another local electronics store I currently frequent is Ford Electronics on Orangethorpe just west of the Fullerton Municipal Airport. They are a bit smaller than ORVAC but they have a very nice selection of parts, many of which are still in the tall sided cardboard bins. I like them because they're more family/pop run but ORVAC does also have a nice selection and a lot more commercial sound stuff too.
Anelectronics company I used to frequent was/is ITC Electronics. They had a store in Hawthorne on Imperial Highway near the 405. Had all the crazy surplus stuff you could find. They still have a store on Olympic in LA, I thought they had a store in Torrance on Hawthorne but I don't see it listed anymore. Had a lot of speaker stuff there, catered a lot to the DIY autosound and home.
Can't forget Olson Electronics, which was on Century Blvd. near the 405, home of the parts grab bags and rather sort of pedestrian offerings. Never thought they were all that good but they seemed to thrive for a while from all the local aerospace guys. Same for Inglewood Electronics about 2 blocks up the street, small shop with some parts stuff but for me, my first exposure to the early 70's Kenwood, Fisher, and Scott stereo gear. Wasn't much of a showroom but had a lot of gear on display.
Newark Electronics, an industrial distributor still in business had a main office another block west.
The two Pacific Stereos I visited often were in Inglewood on Manchester about 4 blocks east from downtown across from Sears, and their very nice Torrance store on Sepulveda and Hawthorne. After bike riding, I'd go there and try to get into the high end rooms just to look at all the Marantz and Pioneer racks of gear, and some of the really nice stuff that I can't remember the names of. I do remember getting a pair of hanging Bose 901's to rocking/swinging once we were able to turn it up! Remember the stacks and piles of boxed gear with prices on it just waiting to be picked up and taken to the counter?
I also visited a lot of the Federated stores while at UCLA. The nearest was on Olympic (?) in West LA, listened to alot of RTR's there, and the La Brea store in Hollywood not long before they closed down.
Lots of good memories there.