Can anyone explain this? The amp has developed a fault that two people have been unable to identify. The amp has developed a n intermittent fault where it 'howls' for a few seconds at a time. When it is howling, there is no instrument signal getting through. When it is not howling, it sounds perfect, not the slightest hum. Here is a video of the howl. It happens on both channels with an instrument plugged in or not. It's not the instrument, the leads or the speaker. The fault is definitely in the amp.
Acoustic Image are no longer operating so I can't go back to the source although there is an email address on the website I have contacted and am waiting for a response.
Any ideas?
PXL_20260130_111344793.TS~2.mp4