I used to service those amps back in the day... At the shops where I worked I tended to be the one doing the tube equipment when it showed up.
The output transformers were pretty decent. But the parts quality was pretty bad. They used paper and oil coupling caps but had reliability problems (I've seen them leaking more than once). The tube sockets were terrible and were prone to bad connections.
I can't comment on the sound- its been too many decades since I last saw one. At least I can say that when I fixed them they didn't seem to have any troubles lasting out the service warranty of the shops where I worked.
The output transformers were pretty decent. But the parts quality was pretty bad. They used paper and oil coupling caps but had reliability problems (I've seen them leaking more than once). The tube sockets were terrible and were prone to bad connections.
I can't comment on the sound- its been too many decades since I last saw one. At least I can say that when I fixed them they didn't seem to have any troubles lasting out the service warranty of the shops where I worked.