I just sold a 20 watt tube amp with a really great vintage speaker in it to a guy in the neighboring town. I never played it much anymore so I let it go, but it always saw a few hours of playing time every week. The day that I sold it, the buyer was able to play it for about 15 minutes and loved the tone of that speaker as well, so the deal was struck and all were happy. A day later I get a call that the amp was "garbage" and didn't work. So I drove out to his place and found the V2 tube was dead. I rarely come across a 12ax7 tube go bad in the V2 position, but okay, I replaced it and the amp was back....for awhile. The amp once again sounded great at around 4, but when he introduced a boost pedal and cranked the amp to "stage levels" the speaker sounded blown. At moderate volume it sounded great, but once pushed and especially on a hard pick attack, it would fart out and crackle intermittenly. He accused me of selling the amp with a blown speaker, but I never experienced those noises before in the 8 years that I owned that amp. Admittedly, it has been a home use amp and I never really pushed it all that hard, but the speaker was rated for 5 times the power handling of that amp and seemed strange that it would let go like that despite the age. So, I agreed to replace the speaker with a new Emminence speaker I have on hand in the next couple of days, still disappointed in the speaker disaster. I did learn that the new owner played that amp for 8 hours straight and pushed it hard the whole time without complaint until the vacuum tube went so now I am thinking that the damage was done by the owner, but I guess I am stuck being the nice guy. I don't know, is there a chance the speaker is okay and it is something else? I did disconnect the speaker and run the amp through a different cab and there was no issues even when pushed hard so it pretty much has to be the speaker yet I am still surprised that a little amp could blow out a high rated speaker like that. The cone didn't show any tears, no noise when pushing down on the cone, cap seemed to be intact and in place, yet when pushed hard by the amp with lots of over-drive, it falls on its face. I guess I didn't really ask any questions here, just venting more than anything, but feel really disappointed that a simple transaction to save some space in my practice room is going to end up costing me lots of time, loss of a new speaker, a new tube, and getting back what was a great speaker which now needs to be rebuilt.