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I present a variation on Osaki's tidal-thermal-instability model for SU UMabehavior. I suggest that in systems with the lowest mass ratios, theangular-momentum dissipation in an eccentric disk is unable to sustain the diskon the hot side of the thermal instability. This decoupling of the tidal andthermal instabilities in systems with q < 0.07 allows a better explanation ofthe `echo' outbursts of EG Cnc and the short supercycles of RZ LMi and DI UMa.The idea might also apply to the soft X-ray transients.Comment: To appear in PASP, April 2001 (6 pages, 4 figs

On Echo Outbursts and ER UMa Supercycles in SU UMa–Type Cataclysmic Variables