The conventional, scintilator-photomultiplier type of electron collection system cannot be used satisfactorily to examine hot orelectron emitting specimens. The main difficulties are: a) light from the specimen or heater can reach the pm tube and produce a spurious output, b) heat from the specimen can damage the plastic scintillator used in the collector assembly, and c) electronemission from the specimen must be kept substantially below the beam current of about 10-11 A.