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We describe how unbounded three--form fluxes can lead to families of $AdS_3\times S_7$ vacua, with constant dilaton profiles, in the $USp(32)$ model with"brane supersymmetry breaking" and in the $U(32)$ 0'B model, if their(projective--)disk dilaton tadpoles are taken into account. We also describehow, in the $SO(16) \times SO(16)$ heterotic model, if the torus vacuum energy$\Lambda$ is taken into account, unbounded seven--form fluxes can supportsimilar $AdS_7 \times S_3$ vacua, while unbounded three--form fluxes, whencombined with internal gauge fields, can support $AdS_3 \times S_7$ vacua,which continue to be available even if $\Lambda$ is neglected. In addition,special gauge field fluxes can support, in the $SO(16) \times SO(16)$ heteroticmodel, a set of $AdS_{n}\times S_{10-n}$ vacua, for all $n=2,..,8$. String loopand $\alpha'$ corrections appear under control when large form fluxes areallowed.

$AdS$ Vacua from Dilaton Tadpoles and Form Fluxes