Are you sure the tubes are at fault? You would not want to replace them with expensive tubes only to have that happen again.
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I have about 500 hours on my Shuguang Treasure Series(Black glass) tubes. They sound wonderful and have been reliable.I got them from Grant Audio for 600.00 per pair, not cheap but I have no complaints. The Frankenstein MK2 amps are top tier and deserve premium tubes. Israel Blume has warned amplifier owners about premature failure with these KR tubes,
I've had the Victory IV's for almost a year and I have no desire to get ride of them. I was using them with a well known 300b amp, which I sold. I purchased a Coincident Frankenstein amp and the speakers sound much better . Then I purchased coincident Extreme power cables and rca interconnects and I can't believe how much better everything sounds. Never sounding harsh very well balanced sound from top to bottom.
If you purchase the victory IV's and you don't like the sound it's not the speakers.
I think Coincident is the best value for the dollar !
Israel is always quick to respond to emails.
Hope this helps.