Skylab
Reviewerus Prolificus
I have to be honest, I don't find there to be a huge difference in the sound of different USA-made 6AS7G's, specifically. The RCAs are by far the most common, and they sound terrific. I *think* I prefer the sound of the black-plates slightly, but the difference isn't huge. ANY USA-made 6AS7G will blow the pants off the stock Chinese tube.
I do think the 6AS7G sounds significantly better than the 6080. That said, Tung-Sol 5998's sound better still. And if you want a lot of detail, 7236's sound very good, providing an almost solid-state type sound while maintaining a nice tube midrange.
I prefer the Tung-Sol 5998's, followed by black-plate, double bottom-D-getter 6AS7G's.
I do think the 6AS7G sounds significantly better than the 6080. That said, Tung-Sol 5998's sound better still. And if you want a lot of detail, 7236's sound very good, providing an almost solid-state type sound while maintaining a nice tube midrange.
I prefer the Tung-Sol 5998's, followed by black-plate, double bottom-D-getter 6AS7G's.