Adjustment of HV and PA gain

We adjust the HV for each tube type and the gain of the preamplifier (PA) in order
to have a similar signal amplitude for the 764keV peak in all of them.
Because of the very different gain between tubes we are not able to combine in the same
PA tubes from RIKEN and UPC, thus we have to go for 10 PA instead of 9:

Settings: Preamp (type), Tube type, HV, Gain, height or 764keV pulse, pulse polarity
PA1 (D), RIKEN, 1450V, LowGain, ~400mV, POS
PA2 (D), RIKEN, 1450V, LowGain, ~400mV, POS
PA3 (D), UPC, 1550V, HighGain, ~400mV, POS
PA4 (D), UPC, 1550V, HighGain, ~400mV, POS
PA5 (U), UPC, 1550V, HighGain, ~600mV, NEG
PA6 (U), ORNL1, 1200V, LowGain, ~400mV, NEG
PA7 (U), ORNL2, 1750V, LowGain, ~400mV, NEG
PA8 (U), ORNL2, 1750V, LowGain, ~400mV, NEG
PA9 (U), ORNL2, 1750V, LowGain, ~400mV, NEG
PA10 (U), ORNL2, 1750V, LowGain, ~400mV, NEG
 
We need  to use two different pulse generators to adjust differently the pulse height
of UPC tubes