So damn hard deciding which tube preamp to buy!

So how best do you match a preamp to an amp?  You hear u should match, but exactly how do u do this?

I think you should have your mommy make the cal since she is footing the bill

 Mommy gone away.  I need to make decision myself. Am a big boy.

And so it (t)rolls on.

Sorry for taking time to get back to you on this.  Was with family at the beach.  
You want to have the right amount of gain, output impedance.  Get those right and the amp will sound great.  If you have too little or too much gain, sound will be bloated or thin respectively.  If the impedance is wrong, then you will issues.

this is a great write up.  
https://forum.audiogon.com/discussions/how-to-match-preamp-and-power-amp

I would stick in the mid teens, 12-18dB of gain with your power amp.  200/100ohm balanced/unbalance impedance range should be good for your amp.  This doesn’t need to be exact and some deviation is allowable.