Ampeg BA115 very loud humming sound

[aroldo]

Has member Evil79's ampeg ba115 defect been resolved? May I know what was the solution?

[DrGonz78]

Ampeg BA115 Schematic

Your output section is blown again.
When those mosfets go they really stress the rest of the section.
Here is what I would recommend.
Check & replace any shorted output mosfets.
Replace the zener diodes & the 47 ohm resistors on the output gates.
Replace the drivers MJE340 & 350
Replace the bias transistor Q3.
Check all of the resistors around thses parts.

This is the solution.