It is shown that the current-voltage characteristics in of plate-or filament-shaped long diodes are essentially different for the isotropic and anisotropic cases. For the effective lifetime of excess carriers in anisotropic case is inversely proportional to the external electric field, the direct current through such a diode increases slower than I -U z , that is "ohmically" I -U . As a result of such difference the characteristics of the isotropic plate-shaped diodes strongly depend on pressure and magnetic field (the effect of a small magnetic field may be considered to be equivalent to the effect of pressure). This indicates that significant tensodiode and magnetodiode effects take place. A satisfactory agreement of the experimental data with the theory has been obtained. HoxyseHo xoporuee cornacHe TeopeTmecmx H a~c n e p~-MeHTaJIbHbIX pe3yJIbTaTOB.
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