Marshall Mosfet Lead Output Stage Problem

[Lee_ranaldo]

i'm back with this amp with no success
i'm gonna attach this amp to a 8 ohm load.

I will post some voltages now without the transistors connected. to avoid more problems. When i fired the amp up i did it for about 8 seconds or less when the buzzing started so i inmediatly stopped using it

the mosfets don't seem to be shorted . but i have to test them.

[J M Fahey]

That 8 second delay probably means they are either over biased or oscillating, either case overheating them very quickly.
Until you have it fully fixed use a series lamp limiter.
Rising brightness shows rising consumption.