I was looking up something last month in Atlanta'a radio history, and one thing led to another. It turned into a huge project.

So I'll just add my two cents worth...
WSB started at 740 and moved to 750 when the FCC changed most of the frequencies in 1941.
WSB landed on 740 in 1928. Previously, it had been on 833 (360 meters) and 619 (400 meters(?)) in 1922 and 1923, 700 in 1924 through 1926 and 630 in 1927.
WAGA was at 1480 for years and was the NBC (Blue) affiliate (which became ABC). I'm not sure if the switch to 590 came at the same time WSB went to 750...
In 1927, WTFI in Toccoa began on 1430 and moved to 1450 in 1928. In 1932, its city of license was changed to Athens and remained until the station went dark in 1936. In 1938, WAGA began on 1450 and moved to 1480, and then 590, in 1941. (I tried to place it on 1480 earlier, but Broadcasting Yearbook kept it on 1450. :

) (WYZE began on 1480 in 1956.)
I know that by 1950 WCON (550) had the ABC affiliation...
WCON signed on 550 in 1947 and stayed until 1949. The city of license was moved to Gainesville and WGGA went there from 1240 in 1953 (WGGA signed on 1240 in 1941.).
WGST was affiliated with CBS during the '30s and the war years...
WGST is interesting. It seems that 2 days after WSB (
Atlanta Journal) signed in on 1922, a station named WGM (
Atlanta Constitution) signed on and was placed on or about 710 in 1922, but was moved to 1110 in 1923 when given to Ga. Tech and renamed WBBF. In 1925, WGST started on 1200 and quickly merged into WBBF at 1110, but kept the WGST calls. The station moved to 890 in 1928 and stayed until The Big Switch in 1941 that placed WGST on 920.
WAOK is even more interesting: WTHS started in Atlanta in 1927 on 1310. It signed off the next year and WRBI of Tifton, Ga. took the 1310 slot. It moved to 1370 and became WJTL in 1931 and moved to (incorporated) North Atlanta in 1932 - affiliated somewhat with Ogelthorpe University. In 1935, it moved to Atlanta and became WATL, where it stayed until 1941 when it was moved to 1400. WATL moved to 1380 in 1948, and 1400 was filled by WDUN in Gainesville (which moved to 1240 in 1953 to take the place of WGGA that had moved to 550). In 1954, WATL changed to WAOK, and that's that.
* Piecing together info from old Yearbooks and radio logs (which may or may not be totally accurate) is tough, but rewarding - like investigation. If you have any first-hand knowledge that adds to or changes the facts, please post them.