Understanding Proportional Counter Circuit

[KillMartin]

TL;DR Summary

In study and developing a proportional counter, I ran into the problem of how should I connect multiple counters to one single preamplifier correctly (and cheaply).

Hi, I am a graduate student currently studying on the topic of simple gas filled proportional counter. In the effort of trying to make my own system, I ran into this problem that how should I connect multiple counters to one single preamp correctly (and cheaply).

This is the circuit I'm working on right now for a single proportional counter. The schematic is produced with LTspice. Where the tag "Out" would be the input for the charge sensitive preamp that is not shown.

I came up with these following possible circuits as a complete electronics novice shooting in the dark.

Any comment would be greatly appreciated as I am trying to learn. I am currently reading on how to use LTspice to generate the input signal I want so I could play around and test to see the output signal.

 

[LightHero]

1. A voltage divider circuit where the two counters are connected in series and the output of one is fed to the input of the other.2. A single preamp with a differential amplifier configuration that takes the outputs of the two counters.3. A circuit with two preamps, one for each counter, and the outputs of the preamps are fed to the differential amplifier.4. An operational amplifier circuit with two inputs, one for each counter, and the output of the op-amp is fed to the charge sensitive preamp.I believe these four circuits should all work but I am sure there could be better ways to do it.Thanks in advance for any advice or comments!