I picked up a plate transformer from a hamfest today. It is old and was made by Chicago transformer. It still has the original tag and is model 2520. I’ve read online that this may be a plate transformer from a Collins 30k-5 (if I remember correctly) am transmitter. Can someone explain to me how a transformer this large is only rated @ 300-400 ma when it is this large and weighs 71 pounds? It’s only rated at 1kva also. Were these rated really conservatively or what? Any and all comments welcome. Thanks!