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Rectifier 280 tube problem ? loud and soft

Have a yamamoto a08s with 280 rectifier tube. The amp was working fine then the volume start to turn soft for a short period before going back to normal. This happened a few times. I noticed that the filament of the 280 tube dimmed when the volume went down. Does this indicate that my 280 tube is dead or some other problems ?


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Topic - Rectifier 280 tube problem ? loud and soft - tangotango 19:25:14 03/16/14 (2)

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