Hi all. I picked up a plate transformer at a hamfest today. It is a Chicago Transformer P2520. A google search said this was the plate transformer from a Collins 30k-5 commercial AM transmitter. It’s only rated @ 1kva and shows dual 115v primary taps and secondary taps @ 2000 and 2500v. I’m hoping someone in this AM forum may be familiar with this transmitter and may be able to give me more insight regarding the possibility of using this plate transformer in an hv power supply for tube amplifier project. My main questions are, why is this thing so big and heavy yet only rated @ 300-400ma ccs on the secondary? And is the gonna be suitable for a 1.5kw pep SSB amplifier? Were these old transformers underrated for their size and really good for more current handling capabilities or is that just how they were built back then? Thanks for any and all feedback/help!