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Electrical conductivity and thermoelectric power of lead‐doped thallium selenide (TlSe) of various doping concentrations have been measured. It is found that the material always remains p type. At room temperature, thermoelectric power shows a maximum for a certain value of conductivity and thereafter decreases with increase of conductivity. A qualitative discussion of the applicability of the two‐valence‐band model is also presented.