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Questions about retubing BAT VK-75SE

I have retubed the four 6C33C power tubes on my BAT VK-75SE yesterday. Do I need to retube the 6H30 input tubes and the six 6SN7 driver tubes at the same time? Do the input tubes and the driver tubes last longer than the output tubes?
sidssp

Showing 2 responses by sidssp

sidssp OP
1,077 posts
 
Newbee,
I don't know what caused the cracks. I am just afraid it might have been damaged in some ways that I am not aware of. It probably means nothing other than making me feel better.
sidssp OP
1,077 posts
 
Jfrech,
I also posted on AA and V.K. replied that the input and driver tubes should last longer than the output tubes and don't need to be replaced at the same time. But I just noticed that two of the 6SN7s had developed cracks at the base so I am going to replace them anyway. But finding matched pair is difficult enough; I don't know where I can find matched triples. Do you know know of any good source?
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