The wind and react method has been used to construct small size superc
onducting coils with Bi-2212/Ag single core and multifilamentary round
wires. Critical current measurements vs field and temperature perform
ed on short wire samples and coils, treated at the same time in furnac
e, demonstrate wire degradation during coil manufacturing. Specific ca
racterizations and tests, executed on our coil prototypes, allow to ma
ke considerations about the main causes of wire degradation to be remo
ved in order to improve the manufacturing technology.