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Just wondering what is the life of 6550 power tubes.I,ve seen numbers like 2000 hrs ?.Also driver tubes 6qf7 are they also 2000 hrs?.If only the two driver tubes 6qf7 are changed do i need to re bias?,and will different brand tubes change the sound.
thanks for your help.
Follow Ups:
6FQ7 driver tubes should last much longer than 2,000 hours in this application. More in the 5,000-7,000 hours depending on the tubes.2,000 hours for the output tubes is about right.
You can install new 6FQ7 without changing output tube bias.
Sonic difference between 6FQ7, for this application, is probably minimal, if any at all. ARC supplies GE. Sylvania or RCA would also be a good choice. Just about any NOS Western made 6FQ7 sounds good, are plentiful, and are available at reasonable prices. Many sponsors on this forum have this tube.
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