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Normal
Mine will pop sometimes. Depends on the power modes set for each channel or if the CH3 is set to triode on the back panel. CH1 and CH2 will run the tubes in pentode mode unless you are using 10W power setting as that will force triode mode to be switched. Also, if you are using tube tracking at 45W vs diode setting with CH1 or CH2 that can make a pop sound when changing to those channels.