A 46V25 is not a bad set. You can get a picture comparable to a new NTSC set on most of them. While they didn't use the SD series CRTs, what they did use seems to have held up ok. With strong CRTs and a clean mirror and lenses you should be pleased with the picture.
If you get it for free and get it fixed for $300 you are doing good, if $500 there are second thoughts. As a guideline, if it's $300 to fix but they'll buy it for $150 or more get it fixed. Ask them straight out, "what is it worth now, and what is it worth running ? " .
It's best to decide after you have those answers.
JURB