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Guitar Myth Busting: Tubes Change The Amp's Tone At All?
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Marshall DLS40CR | Swap and Bias Tubes
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How to Test the Integrity of Tubes in a Tube Amp (The Wood Pencil Test)
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Valve Failure! Spot the Warning Signs | Too Afraid To Ask
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Marshall JVM 410C Repair. Replace Tubes, Fuse and Bias
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Old Tubes Vs New Tubes / How To Change Amp Tubes
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How To Test Bad Tubes With A Stick
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