Should I continue to put money in this amp?

[karpathion]

From your description it seems more like a bias component problem than a valve one, which would be a lot cheaper to fix than replacing your valves.

I thought that too, but the bias will hold at the 18ma recommend by Lee Jackson. The tubes just started changing color last night. I just want to believe it's tubes. I've seen the same thing before.

If nothing else you can have fun electrocuting yourself.

I'll be fine as long as I stick to my safety procedures. 
Drink a 12 pack of beer, and take a Xanax. Yep, that should do it.