  Using a doping-determined multiband model spectrum of a "typical'' cuprate
the effective mass of the paired carriers is calculated on the whole doping
scale. Large $m_{ab}$ values quench rapidly with leaving the very underdoped
region. Further slower diminishing of $m_{ab}$ reproduces the trend towards
restoring the Fermi-liquid behaviour in cuprates with progressive doping. The
interband superconducting condensate density ($n_s$) shows similar behaviour to
the transition temperature and superconducting gaps. The $n_s(0)/m_{ab}$ ratio
has an expressed maximum close to optimal doping as also the thermodynamic
critical field. All the overlapping band components are intersected by the
chemical potential at this. The pairing strength and the phase coherence
develop simultaneously. In spite of its simplicity, the model describes the
behaviour of various cuprate characteristics on the doping scale.
