The main electro-optical properties of the new fast and low-gain hemispheri
cal PMT from Electron Tubes Ltd. have been studied. This PMT is considered
as photosensor for the camera of the 17 m diameter air Cherenkov telescope
MAGIC to be installed in two years at Canary Island La Palma. The dependenc
e of the single-electron resolution and afterpulse rates as well as lineari
ty on the interdynode voltages have been studied in detail. (C) 2000 Elsevi
er Science B.V. All rights reserved.