2N3901 semiconductor manufactured by Sylvania, listed as 2N3901 (circa 1979).

2N3900A semiconductor manufactured by Sylvania, listed as 2N3900A (circa 1979).

2N3900 semiconductor manufactured by Sylvania, listed as 2N3900 (circa 1979).

2N3899 semiconductor manufactured by Sylvania, listed as 2N3899 (circa 1979).

2N3898 semiconductor manufactured by Sylvania, listed as 2N3898 (circa 1979).

2N3897 semiconductor manufactured by Sylvania, listed as 2N3897 (circa 1979).

2N3896 semiconductor manufactured by Sylvania, listed as 2N3896 (circa 1979).

2N3883 semiconductor manufactured by Sylvania, listed as 2N3883 (circa 1979).

2N3880 semiconductor manufactured by Sylvania, listed as 2N3880 (circa 1979).

2N3878 semiconductor manufactured by Sylvania, listed as 2N3878 (circa 1979).

2N3877 semiconductor manufactured by Sylvania, listed as 2N3877 (circa 1979).

2N3873 semiconductor manufactured by Sylvania, listed as 2N3873 (circa 1979).

2N3872 semiconductor manufactured by Sylvania, listed as 2N3872 (circa 1979).

2N3871 semiconductor manufactured by Sylvania, listed as 2N3871 (circa 1979).

2N3870 semiconductor manufactured by Sylvania, listed as 2N3870 (circa 1979).

2N3869 semiconductor manufactured by Sylvania, listed as 2N3869 (circa 1979).

2N3868 semiconductor manufactured by Sylvania, listed as 2N3868 (circa 1979).

2N3867 semiconductor manufactured by Sylvania, listed as 2N3867 (circa 1979).

2N3866A semiconductor manufactured by Sylvania, listed as 2N3866A (circa 1979).

2N3866 semiconductor manufactured by Sylvania, listed as 2N3866 (circa 1979).