In this paper the results of electron tunneling measurements in two classes of high Tcsuperconductors are reported. In the cubic BiO3materials (notably BaPb1−xBixO3and Ba1−xKxBiO3) the results show these materials to be BCS superconductors. Indications point to electron‐phonon coupling as the pair binding mechanism but quantitative verification still eludes experiment. In the cuprates (most of the data is on YBa2Cu3O7‘‘gap‐like’’ structure is observed but it is not BCS‐like. Potential reasons for this deviation are discussed and some indications in the tunneling data for the pairing mechanism are revealed.