Phase Linear Phanatic
Chief Journeyman
- Joined
- May 26, 2013
- Messages
- 713
- Location
- St. Louis, MO.
- Tagline
- Born and Raised In The 700 Watt Club.
If you follow the grounding schematic literally and explicitly then You should not face hum issues.
The normal/direct switch body should have NO wire connecting it to the floating copper input plate. The switch body will become chassis ground by virtue of the screws that mount it. All those little bus wire jumpers that PL added should be removed. The only bus wire jumper should be between the 2 negative speaker binding posts (this is shown on the schematic)
The end result should be that the ONLY connection between the star point ground and chassis ground occurs at the center lug of each of the 3 terminal solder lug strips mounted to the backplane
Hope this is clear
Joe, there IS no connection to the floating RCA bar. I cut it. There is no wire from the normal switch to the spaker posts. I cut that also. I had hum. Now its true I still need to add a new and seperate wire to the speaker negative binding posts, and run it over to star ground, Lee has already dircted me to do so. But also take note, that you say the normal/direct coupled switch should be chasis ground by virtue of the screwes that hold it on to the amp. However, my amp has a wire that comes off there and ties into one of the triple bars on the back panel, then over to star ground. So wouldnnt that be redundant and need to be removed? Also, chasis ground for the WOAPL board, ties to the negative speaker binding posts, which lead to star ground directly through a dedicated wire. So it looks as though my wire i need to add is already there?? This leads me to believe that the wire going from the back panel to the normal/direct coupled switch, just needs to be removed. Does this sound like the correct solution to isolate my ground problem and solve my hum issue?
I just read in an unrelated post, that posting large pictures to inline text, can only be done using a photo sharring site. And i took my recent pics in full resolution. Perhaps too large for this and why i cannot upload images lately. I will downsize my photos now and see if that solves my picture posting problems. Maybe then I can provide pics of the issue. Well.......one ten hour day down; five more to go before I can get back to the PL. Have a good evening fellas.