Some years ago, the Philadelphia Jewish Archives Center http://www.philajewisharchives.org/ moved its materials to the Temple University Paley Library Urban Archives.
I have been out of Philadelphia for 30-something years, and my last visit to Temple University campus was shortly before my Aliyah about 6 years ago. The Urban Archives staff had always been very helpful and facilitative during my personal visits over the years (but that was in a different era before this COVID-19 madness).
You might wish to make inquiry there.
As for Phoenixville, the last I heard they still have a synagogue there, perhaps that might be a tree for you to bark up.
Best of luck in your searches,
Petach Tikva, ISRAEL
Belarus: Gomel: RAISKY, SHKOLNIK(OV), ARONOV, AEROV
Ukraine: Yelizavetgrad: Broad/Brodsky (also Odessa), Gertzig/Gertzog
Ukraine/Russia/Turkey: Yevpatoriya: Israelson, Arshenov