FWIW, I bought one of those EC-1002 irons on ebay. $44 delivered. It is not here yet so I can't give an action report. I was wrong about the tips, they are cheap, $3-4. Of course any place selling them for that price has a $25 minimum order. I will assume that I can go to an electronics retailer and buy one for $7-8. They use "ET_" tips, COMPLETELY different from a WTCPT and, indeed, you will DAMAGE one by using the wrong tip. Yes, damage, as in fry the transformer. They work completely and totally differently, use different voltages, different operating principles.
I would still heartily reco a WTCPT (has the separate sponge-spring holder) or the WTCPN one-piece everything for 98% of soldering use. I have definitely noticed the WTCPNs tend to be older and skungier, if used. And they ARE used, because I don't think Weller has made the "N" for quite a while. Gotta watch out--these have been made since the 70's, and you could buy a goofball one if you're careless. You can imagine, that when the iron holder spring goody and sponge are right above the transformer housing, the housing will get "fluxed up" more than if SpongeBob is separate.
I still have the iron part of my WTCPT and tried, after being in this thread, to run it from a 21 VAC ~~4 amp transformer I have lying around. Couldn't get it to work....it should. Then I thought that of all the things I don't want to be a hindrance, it would be my soldering item. So I bot this used one.
The one thing I'll say about the WTCPT I had was that it seemed to have a way about getting in, getting out, with the right temperature, and consistently leaving a nice shiny solder joint. It was a fine device, a joy to use. I WILL say that I used it 95% on transistor and chip stuff, though I made zillions of XLR and phone cables with it. I suspect a chisely tip (vs cone) would be better for tube sized terminals, and I expect to have to go hunt one down.