Picked up a 1 owner unmodified/unrestored Fisher 500C based on Steve's recent thread. Even has original yellow Fisher tubes. I'd like to hear how she sounds "as is" before sending her out and comes back with many replacement parts. I don't have a Variac and wouldn't know what to do with one if I did. Will anything bad happen if I just hook up the speakers and turn her on? It's been several years since she was last powered up. Worked fine up till then.