Interestingly KRSC-AM and KIRO-AM were founded in 1927. KOMO-AM launched in 1926. KFOA-AM was on as early as 1923. Another source puts him on 1300 KOL-AM in the 1940s. But KOL-AM wasn't on 1300, it was on 1270. On the upside, at least KOL existed in 1933 all 1000 watts of it. KOL-AM is presently on 1300 so I am assuming that's a failure of memory and not of math. regardless the KOL reference cites the program as called Bass Harris's House of Joy. He mixed pop sides with swing and played both black and white artists in 15-minute blocks.
Some of the confusion may come from a rather unpleasant set of frequency and call changes in the Seattle market painfully shuffling heritage calls around the metro. For several decades the 1090 kHz frequency in Seattle was home to KING-AM, founded in the late 1940s by broadcasting pioneer Dorothy Stimson Bullitt. KING-AM was known as the "Mighty 10-90," featuring great radio personalities such as Frosty Fowler, Ray Court, Mark Wayne and late night talk with Irving Clark. It became a talk station in 198s. As of 2004, 1090 became KPTK-AM still airing news/talk.
After all the conjecture I find Bass Harris in a radio schedule in the Long Beach Press-Telegram Newspaper. He's listed on 710 KMPC-AM October 11th 1952 at 8:00 PM between the St. Francis Hour and a program called "Dance Time." The Book Swingin' on the Ether Waves identifies his KMPC program as "Bass Harris At Home." An article in the Los Angeles Sentinel called him a "longtime star of stage and radio." If true, he would have already been on air for about 20 years. His program was described as follows:
"Harris will intersperse his own humorous and philosophical poems and monologues with the latest recordings and guest stars."He appears on 1330 KFAC-AM .according to the August 22nd 1953 issue of Radio Today he had a program at 9:00 AM that Saturday following Unity View and preceding the Federation of Churches program. KFAC was largely classical during the week. In 1955 in another issue of Radio Today I find him on air at 640 KFI-AM at 8:00 AM on a Saturday after the news and before a program called "Jump Jump." There the trail ends after two long and mysterious decades.