Originally Posted by rb2013
Staticy pops? Yeah GLH is a just that a hum. But just to be sure the ground wire is not tarnished (DeoXit Gold works good here as well) from the table/arm and well connected to the phono pre. And same for the RCAs - especially if you haven't used it in awhile. I doubt a WiFi router would cause this kind of RFI.
Seems it really is WiFi interference. I tested this way: turn off one PC completely; problem still there. Disable WiFi adapter in main PC; problem still there. Re-enable that adapter: major noise as it's establishing its connection. Static-y pops/crackle become a screech briefly. 100% repeatable.
I cleaned the relevant RCAs and then applied the same DeoxIT Gold I use on tubes (came in the Survival Kit).
re: grounding, this is my next task. The TT has no ground wire, and the plug isn't even polarized, just straight blades. Not sure if that matters. The manual I snagged from Vinyl Engine shows a ground wire associated with the RCAs coming out. Just not there, and can't recall it ever being there. There is a single small brass looking screw where the power cord comes out. There is no matching screw on the other side of the back of the TT. Do you think I could rig a ground wire using a crimp-on U-shaped connector on that screw and whatever the Mani phono stage takes (looks like RCA or U-connector).
Also going to try and isolate the TT or Mani (wall wart, I'd guess), but not sure about procedure. With TT, I guess I can plug it straight into an amp (Lyr or C5). Don't care about music, as the problem happens with the platter not even spinning, much less needle to vinyl. With the Mani, I'm hesitant to plug in anything but a TT. As with the TT, I don't think the non-TT source would have to be outputting a signal in order to replicate the problem. If I can isolate it, then I can decide whether or not to return the Mani and try a different phono preamp, or get a cheap TT to replace the JVC (Audio-Technica at $100 is doable). Don't want to invest too much in another TT at this point. Maybe something vintage in the future.
Sorry for the major OT, folks, but maybe this will help someone else.