Galvanomagnetic measurements have been carried out on a number of single-crystal samples of $n$-AlSb(Te), with room-temperature carrier concentrations between 5\ifmmode\times\else\texttimes\fi{}${10}^{16}$ ${\mathrm{cm}}^{\ensuremath{-}3}$ and 2.5\ifmmode\times\else\texttimes\fi{}${10}^{17}$ ${\mathrm{cm}}^{\ensuremath{-}3}$. The measurements were carried out over the temperature range 77 to 500\ifmmode^\circ\else\textdegree\fi{}K. An impurity activation energy, extrapolated to 0\ifmmode^\circ\else\textdegree\fi{}K, of 0.068 eV is obtained from the Hall data. Above 250\ifmmode^\circ\else\textdegree\fi{}K, the temperature dependence of the Hall mobility is proportional to ${T}^{\ensuremath{-}1.8}$. Magnetoresistance measurements were performed at fixed temperatures in the range 77 to 295\ifmmode^\circ\else\textdegree\fi{}K. The magnetoresistance was found to be proportional to ${H}^{2}$ up to at least 30 kG. The relations between the various magnetoresistance coefficients follow very closely those required for a [100] multivalley conduction band. The anisotropy parameter $K=(\frac{{m}_{\mathrm{II}}}{{m}_{\ensuremath{\perp}}})(\frac{{\ensuremath{\tau}}_{\ensuremath{\perp}}}{{\ensuremath{\tau}}_{\mathrm{II}}})$ is found to be \ensuremath{\sim}7 at room temperature in the sample of lowest carrier concentration (where the $m'\mathrm{s}$ are the effective masses and the $\ensuremath{\tau}'\mathrm{s}$ the relaxation times referred to directions parallel and perpendicular to the unique axis of a spheroidal surface of constant energy). This value decreases to \ensuremath{\sim}3 at 77\ifmmode^\circ\else\textdegree\fi{}K, suggesting increasing anisotropy of scattering due to ionized impurities. An argument is presented in favor of the prolateness of the ellipsoids. Assuming $\frac{{\ensuremath{\tau}}_{\mathrm{II}}}{{\ensuremath{\tau}}_{\ensuremath{\perp}}}=1$, $K=7$, six valleys, and a conductivity effective mass of $0.30{m}_{0}$ (where ${m}_{0}$ is the free-electron mass), we obtain ${m}_{\mathrm{II}}=1.50{m}_{0}$, ${m}_{\ensuremath{\perp}}=0.21{m}_{0}$, and a density-of-states mass ${{m}_{D}}^{*}=1.34{m}_{0}$.