2N1777A semiconductor manufactured by Sylvania, listed as 2N1777A (circa 1979).

2N1777 semiconductor manufactured by Sylvania, listed as 2N1777 (circa 1979).

2N1776B semiconductor manufactured by Sylvania, listed as 2N1776B (circa 1979).

2N1776A semiconductor manufactured by Sylvania, listed as 2N1776A (circa 1979).

2N1776 semiconductor manufactured by Sylvania, listed as 2N1776 (circa 1979).

2N1775A semiconductor manufactured by Sylvania, listed as 2N1775A (circa 1979).

2N1775 semiconductor manufactured by Sylvania, listed as 2N1775 (circa 1979).

2N1774A semiconductor manufactured by Sylvania, listed as 2N1774A (circa 1979).

2N1774 semiconductor manufactured by Sylvania, listed as 2N1774 (circa 1979).

2N1773A semiconductor manufactured by Sylvania, listed as 2N1773A (circa 1979).

2N1773 semiconductor manufactured by Sylvania, listed as 2N1773 (circa 1979).

2N1772A semiconductor manufactured by Sylvania, listed as 2N1772A (circa 1979).

2N1772 semiconductor manufactured by Sylvania, listed as 2N1772 (circa 1979).

2N1771A semiconductor manufactured by Sylvania, listed as 2N1771A (circa 1979).

2N1771 semiconductor manufactured by Sylvania, listed as 2N1771 (circa 1979).

2N1770A semiconductor manufactured by Sylvania, listed as 2N1770A (circa 1979).

2N1770 semiconductor manufactured by Sylvania, listed as 2N1770 (circa 1979).

2N1764 semiconductor manufactured by Sylvania, listed as 2N1764 (circa 1979).

2N1763 semiconductor manufactured by Sylvania, listed as 2N1763 (circa 1979).

2N1762 semiconductor manufactured by Sylvania, listed as 2N1762 (circa 1979).