On Thursday, July 18, 2019 at 12:57:40 PM UTC-4, wrote:
On page 2-6 you will notice that pin 5 and pin 18 are for different types of mics....

I replaced a microair 760 with a Euro AR4201 this spring. I used the same boom mic, and pin 18 works for it (electret). I expect hooking a TM170 to pin 5 (dynamic mic) might fix your problem.