Phono cartridge noises
Hi All,
I finally after many years built a new home with a dedicated music room and was quite happy with it until I connected my turntables. I've never run across this and looking for advice as I'm truly lost on what I’m experiencing.
I have two phono preamps, the Jolida JD-9 II / Grado Gold G2+2 High Output cartridge / Project RM 1.3 and a Black Ice Fusion F159 / Grado Reference Low Output cartridge / VPI Scout. Without the cartridges connected I have a slight bit of air noise when I turn up the volume which I kind of expect. As soon as I plug in the cartridges I pick up what I think is internet noise and not in a small way. The high output masks it to a point, the low output can't be used at all. It sounds like I'm on a spaceship! It's a high pitched noise with a morse code like beeping sound, a lot of background kinda rumble/flutter and distortion. The room is wired for ethernet but as yet not connected I only have WiFi in use. When I switch to any other source input on the main preamp all noise goes to silence. I have connected the phonos with different cables from Transparent Audio, Morrow, Original phono cables that came with the tables and even tried an old set of Monster Cables; all produce the same result as soon as the cartridge is introduced into the loop.
Has anyone come across this I'm truly stumped?
K
@lewm I know he doesn’t have hum. But a cartridge susceptible to hum may also be sensitive to RF breakthrough.
Because he said the turntable in another room is fine. i.e. not affected by the antenna.
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@skyy75234 Yeah, the tracer was between me and Lew in discussing signal injection. Are you sure there are no routers/modems/repeaters near the room? Grados can be prone to hum. Have you tried a different cartridge? |
@lewm It's basically adding a signal at any point in a circuit for whatever reason, mainly troubleshooting. See here for more info. In this case the added signal is the unwanted RF. |
@lewm As the interference is only occurring when the cartridge is plugged in, the issue is not with the phono amp itself, and therefore, the Faraday cage wouldn’t make a difference. The noise is being injected. That's why I suggested common RFI solutions above. |
