Is the sound back to normal Deb? If so then it would seem like you simply had a tube go bad...these things happen, and you should have no more worries. If the left speaker is still dead, perhaps the tube took a driver or two with in with some DC leakage.
FWIW, I've found that some equipment, like my BAT VK-75SE amp, are not too friendly to NOS tubes. I spent some big $$$ on a few NOS Sylvania 6SN7's, the right channel (3 per side) crapped out after about a week. The BAT preffered the more durable Russian tubes....lesson learned.
Cheers,
John
FWIW, I've found that some equipment, like my BAT VK-75SE amp, are not too friendly to NOS tubes. I spent some big $$$ on a few NOS Sylvania 6SN7's, the right channel (3 per side) crapped out after about a week. The BAT preffered the more durable Russian tubes....lesson learned.
Cheers,
John