Art Tube MP AMP 12 AX7A Tube Replacement

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Loosen the 4 screws sideways the device, using a PH1

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Use the Smart Wrench to loosen the two In- and Output controllers. Attach the Smart Wrench below the controller.

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Use the Smart Wrench again to loosen the cinch ports on the backside.

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Use the PH 1 to unscrew 2 screws on the motherboard.

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Carefully bend the tube up to get a better view

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Finally just reassemble all parts.