Were the sparks internal to the tubes or inside the amp? Something might be wrong with the amp. Anyway, when I change the 6c33 b tubes on my vk75se, it does take a little breakin on the tubes...not much...like a few days. And I don't notice a very big difference. The input tubes do make a larger differnce. The power tubes just seem to have a little more "umph" when I change them.
Try your old tubes again as a test. If you have more than 40-50 hours on new the new tubes, swap to the old. Now I notice a definite change in sweetness when you power down the 75se and turn it back on like 5 minutes later. After a hour of it settling down all the magic is back.
Good luck.
Try your old tubes again as a test. If you have more than 40-50 hours on new the new tubes, swap to the old. Now I notice a definite change in sweetness when you power down the 75se and turn it back on like 5 minutes later. After a hour of it settling down all the magic is back.
Good luck.