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Amplified Parts has shared an informational video on Yellow Jackets tube converters.

As the video description explains, “we'll compare 10 different EL84 brands in a JCM800 using the Yellow Jackets YJS. The JCM800 typically uses EL34 tubes, but Yellow Jackets allow EL84 power tubes to be used in place of most common guitar amp power tubes, providing a ‘self-bias’ Class-A configuration for the EL84 so that no bias adjustment is required.”

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