The best thing for power transformers is still to pot it and protect it with potting compound instead of letting the core rusts and deteriorate over time. Do not worry about the temperature generated as J&K transformers are designed to work at lower temperature.
|Transformer submerged in potting compound.|
|Solder-tagged and ready to ship.|
|Hi-Hi-B Double C Core being placed into the enclosure - perfect fit.|
|Final look and test before being packaged.|