Hi I have a 512K that has a slight display jitter when the floppy drive is accessed and after being on for about an hour will start a nearly inaudible high pitched whine.

According to Larry Pina, these symptoms are of a failing flyback transformer.

What options do I have for seeking replacements for this?  I assume that they cannot be purchased as new parts?  I am worried if the only option is to transplant them from other machines that ultimately they will all fail.

Any advice?