I have one of these with loud hum in the power amp.
Not filter caps, tried that.
Not preamp, with Poweramp In grounded, it's still there.
Moving green ground wire from pcb gnd to chassis had huge effects. Both location of mounting lug and path of green wire made a huge difference. It was best when just disconnected.
Other than this issue, amp seems to work fine.
Not filter caps, tried that.
Not preamp, with Poweramp In grounded, it's still there.
Moving green ground wire from pcb gnd to chassis had huge effects. Both location of mounting lug and path of green wire made a huge difference. It was best when just disconnected.
Other than this issue, amp seems to work fine.