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Bi-2223 multifilamentary tapes with Ag and Ag alloy (AgMn, AgPdAu) sheaths have been fabricated using the OPIT technique. From thermal analysis and XRD investigations one can conclude that the formation rate and microstructure of the Bi-2223 phase is strongly influenced by the occurrence of a liquid phase during the precursor transformation. The parameters of the thermomechanical treatment were optimized such that values of (77 K, 0 T) could be achieved for tapes of a length up to 550 m, independent of the tape length. On Ag alloy sheathed tapes values of were measured. The value of the tensile strength, which can be applied to the tapes without degradation of was doubled by substitution of Ag alloys for pure Ag sheath material.

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