The 1201-type Hg-Sr-based cuprates with nominal composition of (Hg1-x)Sr2CuO4+delta; x = 0.15, 0.25 and 0.30, were prepared in partial vacuum. XRD data confirms that they are 1201-type structure. The ac-susceptibility measurements of the samples show that for the composition x = 0.15 has a maximum T-c(onset) of similar to66 K. while x = 0.25 exhibits T-c(onset) of similar to50 K. For x = 0.30, the observed T-c(onset) of similar to36 K is at variance with that reported in literature. (C) 2002 Published by Elsevier Science B.V.