The Rotosound 77s were my first ever set of flats. I chose them because I loved the Rotosound 66 rounds at the time. But I had a lot to learn about the world of strings.
At first, you will get the brightness that Rotosounds are known for. Any song with the great Steve Harris playing bass is a great example of this sound. Yet the 77s become dead pretty quickly, which is why Steve Harris changes his strings before every single gig. If deadness is what you're after, these strings might be a great option for you.
The 77s are very tense strings - almost like bridge cables, especially if you tune them in standard tuning. I was not able to get a tension that I liked until I tuned all the way down to C Standard. Therefore, these strings are a great choice if you want to down tune a 4 string bass for doom metal and other genres where lower notes are necessary. However, if you like more tension, these strings are nice for standard tuning, Eb Standard, or even D Standard.
These strings are also rougher to the touch than most other flats. But they're still smoother than most other rounds and pressurewounds. The roughness is a hallmark of Rotosound strings in general, so that's to be expected. Choose another brand if you want the smoothness that you would expect from a set of flatwounds.
If I had to pick a set of Rotosounds to put on one of my basses, it would be the 77s. They're better than the other offerings from this brand, which are subpar at best. However, I would choose another brand altogether for any type of string as the 77s are just average.
