Jinxie, the Megacycle meters are perfect for the application.
No variac needed, just a 240:120 step down trsf.
I have many including the rare UHF and LF heads and coils.
Much wider range than most VNA.
Bonsoir
Jon
PS Joyce Randolph played Trixie ( not Jinxie) in the 1955 TV weekly
I was close .....
Froggie the Gremlin