I can hold my hands on it for 15 secs or more but just barely. I also smell a burnt wood smellThe wood smell (rather than electrical) is probably due to the heat shock the chassis gets as the amp is heating up.
If I were you, I'd take the amp to an experienced tech or very knowledgeable diyer friend to check the circuit. Just in case. (I'd also contact wavac, but you're already onto that.)