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?
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