N Cook wrote:

Doing an axial scrape it was obviously 240K and goes between the rectified
mains + to pin 3 of a 4 pin , TO220 device marked
1HO165B and italic f logo so maybe Fairchild power switch KA1H0165R so
plenty of datasheets,

The startup resistor as Arfa suggested IIRC.

Now that info would have made establishing its value so much easier.

Graham