I’ve been using old Dynaco amps for years and learned how to listen and now have moved to SET amps and super efficient speakers. But before I would purchase a tube amp off of Amazon with a repair facility no where in the country I would look at the Tube4HIFI option. You can buy them assembled with volume control and an ultra linear switch. If you look at the offshore brands they are pretty much copies of the Dynaco design. Same tube compliment but with different more modern look.
To me what’s important are transformers and tube rectifiers. You do only get one input and no remote control if that’s important it’s not a good match but if you want an amplifier that has had a following for over 50 years it’s definitely worth a look.