Does the amp play music even though you hear a buzzing sound ? Or is the amp dead and you just hear it buzz? If it's the former, please do your self a favor and try this : I believe this amp has six driver tubes of the same type ( these are the small tubes ) . Take the tube cover off, and make sure all the tubes are pushed all the way in and seated snugly in the tube sockets. Turn on the amp on and when it starts buzzing, take a pencil with an eraser and gently tap each of the driver tubes with the eraser and see if the amount of buzz or volume of the buzzing changes in a any way. If so, it's most likely a bad or microphonic tube. If you don't hear any difference after having tapped all six driver tubes, try the same thing with the power tubes . If there is no change in the buzzing sound, call the dealer and have him send you ( or go on line and buy ) one driver tube and try substituting the new tube for each of the existing driver tubes , one at a time, after turning the amp off each time you change the tube , and turning the amp back on each time to see if the buzzing has gone away while operating the amp. If this does not solve the problem , pack it up , arrange to send to Tone Merchants and ask them to ship to Shindo. 50/50 or better it's a bad driver tube assuming that the amp is not dead and still plays music.
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