As later found out that the split leads were not stereo to each 303 is the above ok for a 2 way split from 33 to 2×303 in stereo doable?Looking at the specs: the 33 has an output impedance of 1K ohm, with a recommended load of 10K ohm or more. The 303 has an input impedance of 22K ohm, so driving two from one 33 would halve this to 11K ohm, just within the limits, and should therefore work with the split lead as you described. I would always switch the amps off at the wall socket when not in use - why age the equipment unnecessarily.