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It's a pain when projects are missing major items like this, I had to source a transformer for my Vector. If you're not aware there are different types of Bally transformer, you're looking for E-122-131 which would have been used on other machines like Future Spa and Kiss. The number was painted on the top so perhaps an SI owner can confirm. http://www.pinwiki.com/wiki/index.php?title=Bally/Stern#Transformers
Also it might be worth clarifying exactly what you're missing, is it the whole transformer mounting assembly including the rectifier board (AS-2518-49)?
Good luck with your search, perhaps there is a modern alternative, somebody posted a picture on here recently of a classic Bally board setup using what appeared to be a toroidal transformer.
Hi ,I’m not actually missing it ,it’s there but someone said it would be a good idea to replace the big block when I’m changing the rectifier board ,which I’ve bought a new one of
Cheers for the advice also
Ok cool that's good. I'm not sure why you need replace it then, they have a reputation for being reliable, but before connecting it to your new rectifier board you can test that the AC output voltages are within spec. You can find these on the left hand side of the Power Transformer Module schematic.