Marshall JT 30 Amp

[roccosdaddy]

My amp keeps blowing fuses. Need advice on how to fix this problem. Thank you.

[Satamax]

Burn it down!

[Enzo]

First make sure the fuses are the right type.

Which fuses burn? Mains or high voltage? Does it happen the instant you turn the amp on, or maybe only when the standby switch is turned on?

Try removing the power tubes and power up the amp. Does it still blow fuses?

THE MOST COMMON reason for blowing fuses in a tube amp is failed power tubes.