
lo.fi.love
Functionally obsessed.
Ok, some updates.
I grounded the racks and the PS-520 together, and the ground is discharged into an open receptacle on my power conditioner.
I have been probing around my setup with a multimeter and I found something disturbing. There appears to be a short somewhere.
I have my 48 connected to four dbx 150x noise reduction units with RCA - TS snakes. I unplugged the RCA ins/outs from the back of the 48 to do some testing. I have a patchbay on the back of the rack which connects to a snake that goes to the "main" patchbay. So imagine that a line coming from the console, going to a tape input, connects like this:
Line -> "Bridge" patchbay (RCA) -> dbx 150x (TS) -> TASCAM 48
Now, I disconnected the RCA end of a channel from the bridge patchbay. When I check for continuity with my multimeter, probing the sleeve and the tip of the RCA connector, I find continuity. When I remove the TS connector for that line from the dbx 150x and probe the same RCA connector, there is no continuity.
Does this make sense? Is it clear what I am trying to convey? Basically, it appears as though the dbx 150x units are creating a short between hot and cold. This is troubling!
Later, I unplugged the 48 entirely. No power, no cables going in/out... nothing. I plugged a single RCA cable into an input on the 48 and found continuity between the tip and the shield of that RCA cable. Is this supposed to happen??
I'm having a really hard time trying to figure out what this all means. And I also wonder if I'm looking in the wrong place for this hum. Can someone guide me here, and possibly explain what I found?
Thanks!!!
I grounded the racks and the PS-520 together, and the ground is discharged into an open receptacle on my power conditioner.
I have been probing around my setup with a multimeter and I found something disturbing. There appears to be a short somewhere.
I have my 48 connected to four dbx 150x noise reduction units with RCA - TS snakes. I unplugged the RCA ins/outs from the back of the 48 to do some testing. I have a patchbay on the back of the rack which connects to a snake that goes to the "main" patchbay. So imagine that a line coming from the console, going to a tape input, connects like this:
Line -> "Bridge" patchbay (RCA) -> dbx 150x (TS) -> TASCAM 48
Now, I disconnected the RCA end of a channel from the bridge patchbay. When I check for continuity with my multimeter, probing the sleeve and the tip of the RCA connector, I find continuity. When I remove the TS connector for that line from the dbx 150x and probe the same RCA connector, there is no continuity.
Does this make sense? Is it clear what I am trying to convey? Basically, it appears as though the dbx 150x units are creating a short between hot and cold. This is troubling!
Later, I unplugged the 48 entirely. No power, no cables going in/out... nothing. I plugged a single RCA cable into an input on the 48 and found continuity between the tip and the shield of that RCA cable. Is this supposed to happen??
I'm having a really hard time trying to figure out what this all means. And I also wonder if I'm looking in the wrong place for this hum. Can someone guide me here, and possibly explain what I found?
Thanks!!!