We report on the results of tests of FEU115M one inch phototubes manuf
actured in Russia. The tubes are 12-stage, fast devices with high gain
and low dark current. These photomultiplier tubes were developed for
the PHENIX EMCal project by members of the PHENIX group at IHEP, Protv
ino (Russia). We report on investigations of the gain, quantum efficie
ncy, linearity, photocathode uniformity and long-term behavior of thes
e tubes.