Big, bold, and rugged.
I put these into a Fender HR Deluxe... initially, on this amp, the speaker had come a little loose on the face, and it jackhammered the heck out of the amp... killing all the tubes... The Winged C's that were in there sounded of jingle bells when it was done. I tightened it all back up, and it was obvious that the existing tubes had been shaken to death. I got the TS 6L6GC-STR for this amp... as I was hoping the short bottle would be able to be as tough as the Sovtek 5881WXT+... that tube is tough, but they are right that it's not exactly sonic bliss. The TS was installed and biased a little on the cool side... the amp came alive. There's lots of punch, and no noise. I like the way they braced the Micas in this one, as I feel it would reduce movement up and down as well as side-to-side. I can't evaluate the before/after too well, since this was an Amp repair for someone... What I can say is that the TS 6L6GC-STR puts out plenty of volume, no noise, and has the innards secured well in the bottle. This makes me happy, as I'm sick of tubes that Jingle themselves apart when they are hung upside down (like in the HR Deluxe)... this Amp vibrates lots, since it's 40w through a heavy duty 12"...... and the construction of this tube works well in this harsh environment.