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Yes, I tried heat, oils, etc. That core wasn't about to go anywhere! I knew I didn't have anything in my parts stores since the only other set I have new enough to have a 45 mhz if is a philco safari.
I did find a core the same size in some of my parts for old amateur radio gear. I found a core in a healthkit Marauder transmitter. I used a core from the 10 meter section, thinking that since it needed to operate up to nearly 30 mhz it, hopefully wouldn't have excessive losses at 45 mhz. At least it would be closer than a 455 khz if transformer. I carefully broke up and removed the old core, inserted the replacement and gave it a try. It actually seems to work fine. So problem solved, at least with the if. Now if I can only get this thing to converge it should look very nice.
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