Hi
I built my quickie a while back and have used it on CD with no problems. When hooking up to my rega turntable and phono stage there is a massive hum. I don't get this on my other preamp which has a ground lift switch. I'm planning to rewire the. rB300 to put a proper earth wire on it but in the meantime is it possible to add a ground lift switch and how would I do that?
Thanks
Mike