Effects of Bi and Ti substitutions at Tl and Sr sites, respectively, on superconducting and normal state behaviors of (Tl,Bi)Sr 2− x Ti x Ca 0.9Y 0.1Cu 2O 7 ( x=0–0.5) and Tl 1− y Bi y Sr 1.9Ti 0.1Ca 0.9Y 0.1Cu 2O 7 ceramics have been investigated. Temperature-dependent resistance measurements on Tl 0.9Bi 0.1Sr 2− x Ti x Ca 0.9Y 0.1Cu 2O 7 ( x=0) showed metallic normal state behavior with T c onset of 96 K and T c zero of 61 K. Substitution of Ti caused deterioration of superconductivity and gradual change of normal state resistance from metallic behavior ( x=0–0.3) to semiconductor-like behavior ( x=0.4–0.5). Resistance versus temperature measurements on Tl 1− y Bi y Sr 1.9Ti 0.1Ca 0.9Y 0.1Cu 2O 7 ( y=0–0.6) showed optimum superconductivity for y=0.3 with T c onset of 98 K and T c zero of 68 K. The effects of Bi and Ti substitutions on superconducting and normal state behaviors of the ceramics are discussed in terms of ionic radius of elements and the concept of average Cu valence.