Mike Evans asks: >Is anyone running the Hammamatsu R 928 or R1477 pmt at voltages below 300V. > I know the MoFlo has a minimum of 400V so that leaves out the MoFlo >users. I am trying to find out if the PMT works well for a long period of >time below 300. Is it detrimental to the pmt over time? We are not >concerned of linearity and just want to know if we can damage the pmt over >time if running it below the manufactures specification. The major reason the manufacturer specs voltages over 300V is that the PMT is likely to be nonlinear at lower voltages. Lower voltages should not damage the tube; we often run voltages below 300V on scatter channels (the instrument involved needs a PMT to detect scatter signals from small bacteria, for which we use higher voltages, but alignment beads would be off scale unless we ran the PMT at lower voltages). -Howard
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