When I listened to jazz vocal from the morning, suddenly strange sound was coming out past 11:00, One of the vacuum tubes of amplifier of 6V6 was shining, the left speaker was saying "Zaaa" Since sound was never coming out at all, I turned off the switch immediately.
I was not understood what to happen. I asked by telephone the chief of the shop of Hi-Fi-Do. He said to remove and exchange The 6V6 of a vacuum tube to shine. Or if 6V6 are together with all of four, exchanging all. So in my house, I exchanged the all of four, and I turned on the switch. Although, as for the right-side speaker, sound came out normally, From a left-side speaker, only Tweeter comes out but sound did not come out of the direction of the full range at all.
When exchanged to other speakers, sound came out normally. I asked the chief of the shop by telephone once again. He said maybe the capacitor was attached; the direction of Tweeter did not break. However, the direction of a full range, the sound is from low to the high, the voice coil flew and broke. So I did not understand well, I decided to go to the Hi-Fi-Do with the broken full range tomorrow.