It would be hard to compare those totally different(Dynaco named) amps to a Stereo 70. There is one for sale now that has different output transformers on it. Definitely not a Stereo 70 tranny. The others that are painted would be hard or impossible to tell what time frame they were from, as the company went through several different changes on in house made parts, to having them made for them outputs, and other parts. They look nice, and may sound nice, but everyone may have a different version. The one that's for sale now(with those outputs) could never be made to sound like the original.Nice looking though.