No, the companies that build them dont intend for them to be used lightly. Everyone uses the same resistors, no voodoo in there. A 100 watt amp is small potatoes in the world of electronics.
Try emailing them again or hitting them up on facebook. They've had issues for years with either their email system or who's taking care of them. As for tubes, they can last 20 years or 20 minutes. That's just the way it is now.
Well, no. Dimarzio was selling replacement pickups, Gibson was not. You could not buy double cream pickups from Gibson when Dimarzio filed their trademark. A lot of people confuse trademarks and patents whenever this subject comes up. Coca cola trademarked a style of bottle, noone else can use...
No, the Shuguang plant shut down several years ago. Some of the employees started a new company called Psvane. Mixed reviews on the tubes coming out of there, but they're not the same tube.
ULs all go for around the same price unless artist owned or something ($3-4K). You'd have to check reverb for anderson prices, since you dont have any pics.
Bidenomics+California location, hard to do business. Wonder what the remaining manufacturers in Cali are going to do in a few years when trucks are outlawed out there? It's going to be a nightmare for shipping.