A dropper will go in with changed 1uF and new sacrificial IRF740 tomorrow
1KHz RLC testing of the Tx
feedback coil .039mH
240V tap 2.37mH to gnd
230V tap 2.22mH
100V 1.8mH looks reasonable

Along the way that Zener3 in the 200+220V zener chain is probably 6.2V (at
low uA level) and the 2N7002 (SMD topcode mark 782 R) functions as it should