ProTube IV tic tac

[WAGNER GOMES]

My ProTube is doing tic tac like having a clock bomb inside. That occurs in both stages. Stops only when muted. The power is normaly suplied and grounded. Any ideas??

 

[Florin]

Have you tried it in a different location?
Welcome to the forum, btw

 

[WAGNER GOMES]

Do you think it can be some external device interference? I'll try to move it to another position (lot of work to do. Weights like a frigie....)thanks man!