2N5986 semiconductor manufactured by Sylvania, listed as 2N5986 (circa 1979).

2N5973 semiconductor manufactured by Sylvania, listed as 2N5973 (circa 1979).

2N5972 semiconductor manufactured by Sylvania, listed as 2N5972 (circa 1979).

2N5971 semiconductor manufactured by Sylvania, listed as 2N5971 (circa 1979).

2N5970 semiconductor manufactured by Sylvania, listed as 2N5970 (circa 1979).

2N5953 semiconductor manufactured by Sylvania, listed as 2N5953 (circa 1979).

2N5946 semiconductor manufactured by Sylvania, listed as 2N5946 (circa 1979).

2N5945 semiconductor manufactured by Sylvania, listed as 2N5945 (circa 1979).

2N5944 semiconductor manufactured by Sylvania, listed as 2N5944 (circa 1979).

2N5943 semiconductor manufactured by Sylvania, listed as 2N5943 (circa 1979).

2N5915 semiconductor manufactured by Sylvania, listed as 2N5915 (circa 1979).

2N5914 semiconductor manufactured by Sylvania, listed as 2N5914 (circa 1979).

2N5897 semiconductor manufactured by Sylvania, listed as 2N5897 (circa 1979).

2N5893 semiconductor manufactured by Sylvania, listed as 2N5893 (circa 1979).

2N5886 semiconductor manufactured by Sylvania, listed as 2N5886 (circa 1979).

2N5885 semiconductor manufactured by Sylvania, listed as 2N5885 (circa 1979).

2N5884 semiconductor manufactured by Sylvania, listed as 2N5884 (circa 1979).

2N5883 semiconductor manufactured by Sylvania, listed as 2N5883 (circa 1979).

2N5882 semiconductor manufactured by Sylvania, listed as 2N5882 (circa 1979).

2N5881 semiconductor manufactured by Sylvania, listed as 2N5881 (circa 1979).