From Brian Willoughby Sent Thu, Feb 1st 2018, 02:20
From Brian Willoughby Sent Thu, Feb 1st 2018, 02:20
Any time you have a problem with hum, it helps to isolate everything so = you can be sure where it=E2=80=99s coming from. For one thing, try = listening to the 808 with headphones, so that it=E2=80=99s literally not = connected to anything but power and the headphones. If you still hear = the hum, it=E2=80=99s definitely the 808. The club sound system could also be the problem. There are certainly = professional mixers with bad input stages (search for =E2=80=9Cpin 1 = problem=E2=80=9D - there=E2=80=99s even a web site dedicated to the = topic). I assume that a direct box might cure this. If you=E2=80=99re sure that the 808 is creating the hum, and not a = ground loop between the 808 and other gear, then look for loose wires = inside. Obviously, don=E2=80=99t leave the 808 plugged in to power while = looking inside, because you might get a deadly shock. When working on = the Roland TR-808, I=E2=80=99ve noticed that the older units who=E2=80=99v= e seen a lot of use have broken or loose wires. If a ground wire came = loose, that could explain the hum. There are probably lots of potential causes, but hopefully the above = will give you a starting point. Brian On Jan 31, 2018, at 4:16 PM, Kenny Balys <xxxxx@xxxxxxxx.xxx> wrote: >=20 > My 808 has started humming a little bit. Really noticable on stage = with a club soundsystem. >=20 > I have not ever repaired an 808 before so any advice is appreciated. >=20 > The symptom may be 50Hz mains bleed or a frequency that is close. >=20 > What do I need to replace here? >=20 > Thanks in advance for any information. >=20