  The KLOE electromagnetic calorimeter is expected to be reused in the Near
Detector complex of the DUNE experiment at Fermilab. The possible substitution
of traditional Photomultiplier Tubes (PMTs) with Silicon Photomultipliers
(SiPMs) in the refurbished calorimeter is the object of this investigation. A
block of the KLOE lead-scintillating fiber calorimeter has been equipped with
light guides and external trigger scintillators. The signals induced by cosmic
rays and environmental radioactivity have been collected by SiPM arrays on one
side of the calorimeter, and by conventional PMTs on the opposite side.
Efficiency, stability, and timing resolution of SiPMs have been studied and
compared with KLOE-PMTs performance. Conclusions about the convenience of
substituting PMTs with SiPMs are drawn.
