I bought this amp (Orange Rockerverb 50) used on ebay about a month ago and I love it, but I've noticed it gets very noisy if I turn the gain above 12 o'clock (the noise and feedback make it almost unusable). The reviews on harmony-central claimed that the quietness of this amp was great - not for me. Yesterday, a preamp tube went out and I'm wondering if all the extra noise was just the result of this bad preamp tube or could it be something else? Should I replace all the preamp tubes to get rid of this noise, or will replacing the 1 non-functioning tube fix the problem?

try replacing all of them, because I've never heard of anyone else with that problem..
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im to tired and confused to comprehend what you said.