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?
What is it about cracks in the base that you feel make it necessary to replace the tubes? I assume the tubes still have intact pins and hold vacumn. If that is so is there another reason?
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.
I ended up not using triples. Went with matched pairs, but use one pair on the left moost 6sn7 spot for the left channel, then the other matching on the left spot for the right channel, then the next matched pair in the 2 middle 6sn7 spots and so on...
I'm with newbee. If the 6sn7's are working...don't worry about the cracks...
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