Yes indeed, very cool video. Thanks for posting and sharing.
I was also quite surprised that the work(ers) handling the assembly, soldering, etc. of the amp were wearing jewelery and no gloves?
I work in electronics and one of the most important rules (for the worker's safety as well as for the equipments safety, ESD, etc.) is "all jewelery, watches, earrings, etc. even prescribed metal frame glass'es must be removed and 'never worn' :nono: when working!
If not obey'ed and you get caught, well let me just say its a quick way of getting fired. :sigh: