Hello, greetings, I have a Laney lionheart L20 combo, the drive does not activate, there is only something dirty left and the loop, the switch, I have to be moving it so that it can be heard. Would you help me to know what the possible problem is with the drive, the loop I imagine is linked only to changing the switch. Could the drive be that I already have to change the tubes? Maybe you can help and guide me, I would appreciate it.

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