Best for Guitar Amps
In Hi-Fi appication this tube sounds similar to the JJ ECC803S: fast and punchy, yet more euphonic with warmer midrange. Maybe a little bit less of dynamic and detail. So if you want a more correct sound go for the JJ, unless you need to revive thin / coarse sounding systems and / or recordings.
This tube is more suited to guitar amps, where it sound warm but also big and open.