You are correct this adapter is pretty “low end” p. It is from Amazon. Instructions were all in Chinese characters but I was able to discern it requires only 5V so the iPhone block “should” power it.
I will take your advice and try the AV2 just to see. I thought about doing that yesterday but as you suggested, did not want to jam up the works.
I promise to report back and please, if anyone has a good suggestion for a high quality converter, I’m happy to try it!
Again, many thanks for helping me.