Hey there, I just wanted to post that I found out what caused the feedback, although I don't understand it thoroughly. It's the cords that cause the feedback. When I establish contact between one end of the cord and a soldering point that is grounded, e.g. at R82 position, my amp starts to squeal. S...

Well I soldered in some cords, so that I can interrupt the connection from outside the amp by means of switches. The squeaking feedback appears also when switches are in such position that everything should look like in original condition. So either I made a mistake in wiring (I have 5 times 2 cords...

Hi there, I did som tweaking to my DSL15h last Night regarding the lead channel: Clip C75, Clip C76, Clip C34, add R82 150k, that's what others successfully did. Additionally I tried to: - make those changes switchable (mini switches on the rear side of the amp) - Install a variable resistor/poti fo...