Everybody knows this is somewhere

[saturated]

As you may know I'm steadily working my way through this book by Lorne MacDonald and I like it because it has not only lots of problems but each chapter has actual breadboard exercises 

Anyhow I have arrived at this chapter

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So that's cool except for the mind numbing included parts about Q point, maximum voltage swing, input impedance....and dude...yeah alpha crowding 

I'm wondering now in amplifiers when voltage gain is used vs current gain or vice versa.  Or both.

I'm sure this will be revealed.   

This should be simple because hey don't transistors amplify current (Beta, Hfe)

Still I remember scoping the input and output of my old dukane amp and seeing how much larger the output was...in volts Vpp

Ok wait a minute....if we put more current through a resistor guess what we get 

I'm gonna have to order some coffee ☕ from Argentina 

[J M Fahey]

That´s the point.
Tubes also control current output, in this case depending on grid voltage.

That´s why both use a load resistor, as you noticed current develops a voltage across a resistor.

[g1]

In very general terms, the pre-amp does the voltage gain (to boost the tiny signal from pickup or microphone, and the power amp does the current gain (required to drive a speaker).