It's a Marshall AFD100 head on a 1960 cabinet and I've never had problems with it before but today when i turned it on there was a loud buzzing sound and in the back of the amp there was a blue light flashing. This happened for about fifteen seconds and since that happened it hasn't made a sound. I think it might have been a blown tube but I'm no engineer. Please somebody tell me what is wrong with it and how to fix it. Thanks.
OU812
That's some pretty expensive gear. It is also deadly to mess with a tube amp if you do not know what you're doing. Find a local amp repair guy and take it in. No one here can say for sure what is wrong and even if they could you have no business trying to work on it. If you can afford an AFD and 1960 then you can afford a repair bill.
?
My guess is the tubes are gonna and you'll simply need to replace 'em, with the afd100 you can do it yourself coz it has the auto bias feature, but if you're not too sure or don't wanna mess with it, take it down to your local guitar shop and they'll either do it there or send it to marshall hq ;)