I have a 4 tube preamp to run my FX, the old tubes that have been in it for 25 yrs started to go bad,If one tube at the end in the Hot lead #4 was bad even if I do not use that side of the preamp,will it make a problem.Volume drops. What I am trying to say is if One tube is bad,even if it is not used will it effect the whole thing Are all the tubes working all the time
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