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How to get the pulse height spectrum by MCA for pulses less than 100mV?

Dear all,

I need to get a pulse height distribution by a Multi-Channel Analyzer
for a small votage output pulses from a PMT, without amplification,
the height is around 40-80mV, is it possible for any kind of such MCA?
Or maybe I can get the spectrum by a single channel analyzer ? by
counting the pulses between lower level and upper level of the SCA,
althought longer time is need.

Anybody has better idea ?