Ego Tripper
Well-known member
Hello all-- long-time reader, first time poster
I bought an M-308 a few months back for $90. It was pretty dirty but passed signal on all channels. I brought it home, cleaned the exterior & electronics, then found that channels 5 & 6 have a constant white noise on them. The level of the noise can be adjusted with the trim pot, but it's on both the mic and line settings.
So I've just been using the mixer for very basic tasks while avoiding channels 5 & 6. Now that it's summertime and I have time to actually do something about these noisy channels, another problem becomes apparent: after using a few channels for their pres (and using direct outs to Pro Tools) on toms during a drum tracking session, I found that after every tom hit came a short burst of noise.
Now, I've read all the info on the M-300 series I could find, and it seems that they often need a recap at this age. Based on what I know of capacitors, I could see the transient issue with the toms being caused by faulty caps, but what about the constant noise on channels 5 & 6? Does anybody have any ideas what could be causing either of these issues?
I really like the board and I'd like to go about upgrading the opamps once it's fixed... something with a lower noise floor and great transient response... I just want to be sure it's fixable.
I bought an M-308 a few months back for $90. It was pretty dirty but passed signal on all channels. I brought it home, cleaned the exterior & electronics, then found that channels 5 & 6 have a constant white noise on them. The level of the noise can be adjusted with the trim pot, but it's on both the mic and line settings.
So I've just been using the mixer for very basic tasks while avoiding channels 5 & 6. Now that it's summertime and I have time to actually do something about these noisy channels, another problem becomes apparent: after using a few channels for their pres (and using direct outs to Pro Tools) on toms during a drum tracking session, I found that after every tom hit came a short burst of noise.
Now, I've read all the info on the M-300 series I could find, and it seems that they often need a recap at this age. Based on what I know of capacitors, I could see the transient issue with the toms being caused by faulty caps, but what about the constant noise on channels 5 & 6? Does anybody have any ideas what could be causing either of these issues?
I really like the board and I'd like to go about upgrading the opamps once it's fixed... something with a lower noise floor and great transient response... I just want to be sure it's fixable.