How to check your ribbon mics for wear

I've grown to really love ribbon mics. I'm not sure how to test them though.
 
One of my mics came with white gloves for handling. :-)
 
MXL R77
 
In any case, while I'm careful, I do use them. After a session the other day I wondered if the soundhole for an acoustic guitar was pointed too directly at the mic. It's hard to be that careful of where you aim the soundhole when you're having fun.
 
So, that brings me to how to know whether they need attention.
 
In the care and maintenance section for my Royer it mentions...

"Royer"If the microphone is accidentally dropped, test it to see if damage has occurred before returning it
to service. Low output or a dull sound would indicate a damaged ribbon.

 
So if I can't hear a problem, I don't have one, right?
 
I'm actually thinking of recording some track to compare in the future so I can AB the before and after to see if the mic is starting to suffer. I'm guessing pros don't need to do this kinda thing.

Thanks, Jim. I noticed that with the r-121 the first re-ribboning is free too. :-)
 
As a follow up question, when I drop my ribbons in a box to take out to record (I go out quite often), do I have to make sure the ribbon mics aren't near each other in the plastic crate? Both are in wooden boxes.

@Davdud101

https://youtu.be/L3GKLkHxGqI

I made a video where I compared a bunch of Mics and tried to get TH3 to sound similar. My Royer r121 and MXL r77 get compared. You also hear them compared with an sm57, km184, and AKG c414 xls.

To me, the r77 recorded at high impedance sounds similar to the r121 at low impedance. It has slightly brighter high end. I love it, btw.

It came with a pair of white gloves. Ha ha.

The r77 Mic is physically bigger than the r121.

For me, on loud sound sources it has been awesome.

The ribbon on the mxl is thinner than the Royer. Don't walk around holding the Mic with it uncovered. I use the plastic wrap it came in as a Mic sock to cover it when I'm moving it around.

Also, they say be careful of smoke.

While I'm sure they are fragile, I use them and haven't broken them in my first year of use.

I tracked a sax using both the r77 and the km184 for a CD not long ago. Not mine. The engineer loved the recordings.

Thanks Jim.