1957–1963
WHYY-TV was launched (debuted) on September 2, 1957 on UHF channel 35.
1963–1970
In 1963, WHYY-TV changed channels from channel 35 to VHF channel 12.
1970–1972
1972–1974
1974–1978
1978–1981
1981–1984
WHYY-TV PBS 12 welcomes a new partner is WDPB-TV PBS 64 Seaford-Dover, DE-Salisbury, MD-VA it debuted on December 4, 1981.
1984–1986
1986–1997
Used for productions distributed nationally on PBS
Secondary logo (1994–1997)
1997–2000
2000–2019
2019–present
TV stations in the Delaware Valley, including Philadelphia, Northern Delaware, South Jersey and the Lehigh Valley
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Defunct stations
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