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Old 07-22-2016, 12:49 PM
Ralph S Ralph S is offline
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Join Date: Jan 2008
Posts: 153
Dave: You had the same idea I did. Yesterday I went through the complete dynode divider chain and here are the results I found:

Typical voltages suggested by the datasheet:

Grid #1 and 1st dynode 300 vdc
2nd dynode 600 vdc
3rd dynode 800 vdc
4th dynode 1000 vdc
5th dynode 1200 vdc
Anode Voltage 1250 vdc

Voltages measured after changing a few off value resistors due to aging:

Grid #1 and 1st dynode 68 vdc
2nd dynode 490 vdc
3rd dynode 613 vdc
4th dynode 987 vdc
5th dynode 1160 vdc
Anode Voltage 1187 vdc

Not bad, but not terrible either. Any other guesses or opinions? The white spot is still there!
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