Well I can honestly say that I'm done with ordering 6C33C tubes from Russia. In addition to the long wait times because the tubes are coming from around the world. Here are the problems I've encountered.
Defective tubes. 2 burned out and blew the fuse on my monoblock. Another lights up but the top is a dark shade of grey or black. So it looks like one of the 4 is usable.
The 2nd set of 6C33C tubes wasn't packed properly and the Russian Post really mangled the package. I mean they make UPS look like white glove service. The tubes bounced everywhere and 2 of the 4 tubes I ordered shattered on top. Looking at the 2 remaining tube they look ok but I wonder now if they have hairline cracks or cracks I can't see with the naked eye.
I'm hoping Yuriy from the Ukraine does a better job packaging. He didn't get back to me because he was in the hospital and couldn't reply back.
Back to finding a reliable US or Canadian vendor for 6C33C tubes. It sucks to pay such a premium for these tubes but it may be worth it with my luck.