A hybrid contact tray for a mass transfer column, the contact tray comprising: a tray deck (103, 203, 303, 403, 503) for passage of liquid along a liquid flow path thereon, the tray deck (103, 203, 303, 403, 503) having a plurality of orifices for passage of ascending vapor through the tray deck (103, 203, 303, 403, 503); a cross-current vapor-liquid mixing section (111, 411, 511, 711) having a first portion (420, 520a) of the plurality of orifices; a co-current vapor-liquid mixing section (113, 413, 513, 713) comprising at least one co-current mixing device (117, 217, 317, 417, 517, 717) and having a second portion (221, 321, 421, 520b) of the plurality of orifices; and means for altering liquid head levels (440, 441, 540, 541,) with respect to the plurality of orifices i) by raising the first portion (420, 520a) of orifices with respect to the second portion (221, 321, 421, 520b) of orifices to provide an elevation difference between the cross-current vapor-liquid mixing section (111, 411, 511, 711) and the co-current vapor-liquid mixing section (113, 413, 513, 713) or ii) by lowering the second portion (221, 321, 421, 520b) of orifices with respect to the first portion (420, 520a) of orifices to provide an elevation difference between the cross-current vapor-liquid mixing section (111, 411, 511, 711) and the co-current vapor-liquid mixing section (113, 413, 513, 713), such that the liquid head level (440, 441, 540, 541, with respect to the second portion (221, 321, 421, 520b) of the plurality of orifices within the co-current vapor-liquid mixing section (113, 413, 513, 713) is greater than the liquid head level (440, 441, 540, 541,) with respect to the first portions (420, 520a) of the plurality of orifices within the cross-current vapor-liquid mixing section (111, 411, 511, 711), wherein the co-current vapor-liquid mixing device comprises a conduit (219, 319) having: a vapor inlet (221, 321, 421) in fluid communication with one or more of the second portion (221, 321, 421, 520b) of orifices; a froth inlet (223, 323) in fluid communication with the liquid flow path along the tray deck (103, 203, 303, 403, 503); a fluid outlet (225, 325); and a co-current flow path (218, 318) of vapor and liquid within the conduit (219, 319) disposed after the vapor (221, 321, 421) and froth inlets (223, 323) and before the fluid outlet (225, 325). a tray deck (103, 203, 303, 403, 503) for passage of liquid along a liquid flow path thereon, the tray deck (103, 203, 303, 403, 503) having a plurality of orifices for passage of ascending vapor through the tray deck (103, 203, 303, 403, 503); a cross-current vapor-liquid mixing section (111, 411, 511, 711) having a first portion (420, 520a) of the plurality of orifices; a co-current vapor-liquid mixing section (113, 413, 513, 713) comprising at least one co-current mixing device (117, 217, 317, 417, 517, 717) and having a second portion (221, 321, 421, 520b) of the plurality of orifices; and means for altering liquid head levels (440, 441, 540, 541,) with respect to the plurality of orifices i) by raising the first portion (420, 520a) of orifices with respect to the second portion (221, 321, 421, 520b) of orifices to provide an elevation difference between the cross-current vapor-liquid mixing section (111, 411, 511, 711) and the co-current vapor-liquid mixing section (113, 413, 513, 713) or ii) by lowering the second portion (221, 321, 421, 520b) of orifices with respect to the first portion (420, 520a) of orifices to provide an elevation difference between the cross-current vapor-liquid mixing section (111, 411, 511, 711) and the co-current vapor-liquid mixing section (113, 413, 513, 713), such that the liquid head level (440, 441, 540, 541, with respect to the second portion (221, 321, 421, 520b) of the plurality of orifices within the co-current vapor-liquid mixing section (113, 413, 513, 713) is greater than the liquid head level (440, 441, 540, 541,) with respect to the first portions (420, 520a) of the plurality of orifices within the cross-current vapor-liquid mixing section (111, 411, 511, 711), wherein the co-current vapor-liquid mixing device comprises a conduit (219, 319) having: a vapor inlet (221, 321, 421) in fluid communication with one or more of the second portion (221, 321, 421, 520b) of orifices; a froth inlet (223, 323) in fluid communication with the liquid flow path along the tray deck (103, 203, 303, 403, 503); a fluid outlet (225, 325); and a co-current flow path (218, 318) of vapor and liquid within the conduit (219, 319) disposed after the vapor (221, 321, 421) and froth inlets (223, 323) and before the fluid outlet (225, 325).