40ZS electron tube manufactured by Mepco, listed as 40ZS (circa 1988).

40TS electron tube manufactured by Mepco, listed as 40TS (circa 1988).

41PS electron tube manufactured by Mepco, listed as 41PS (circa 1988).

40MS electron tube manufactured by Mepco, listed as 40MS (circa 1988).

A3XW electron tube manufactured by Mepco, listed as A3XW (circa 1988).

11UF electron tube manufactured by Mepco, listed as 11UF (circa 1988).

140UF electron tube manufactured by Mepco, listed as 140UF (circa 1988).

43JW1 electron tube manufactured by Mepco, listed as 43JW1 (circa 1988).

43JW electron tube manufactured by Mepco, listed as 43JW (circa 1988).

N4 electron tube manufactured by Mepco, listed as N4 (circa 1988).

7451 semiconductor manufactured by Allied Radio Corporation, listed as 7451 (circa 1961).

7455 semiconductor manufactured by Allied Radio Corporation, listed as 7455 (circa 1961).

7445 semiconductor manufactured by Allied Radio Corporation, listed as 7445 (circa 1961).

7442 semiconductor manufactured by Allied Radio Corporation, listed as 7442 (circa 1961).

74400 semiconductor manufactured by Allied Radio Corporation, listed as 74400 (circa 1961).

7487 semiconductor manufactured by Allied Radio Corporation, listed as 7487 (circa 1961).

7486 semiconductor manufactured by Allied Radio Corporation, listed as 7486 (circa 1961).

7484 semiconductor manufactured by Allied Radio Corporation, listed as 7484 (circa 1961).

7485 semiconductor manufactured by Allied Radio Corporation, listed as 7485 (circa 1961).

7468 semiconductor manufactured by Allied Radio Corporation, listed as 7468 (circa 1961).