Hi-Fi...Turntable

[trem]

Just hooking all this stuff up again after finishing (almost) my house "remodel".
I imagine this is pretty typical.....probably does not matter what brands these are.?
The integrated amp only has a two wire power cord. The turntable only has a 2 wire power cord.
I plug in the Left/Right RCA connectors of the turntable to the amp. Right above where those connect to the amp, is a small screw and washer that say GND.
Those two RCA coming from the turntable also have a much smaller wire with a spade connector on it. The instructions call it an "Optional" ground connection.
My question is...Finally... what exactly am i grounding with that.? What good does it do to ground the (i guess) chassis of the turntable to the chassis of the amp.?
Hopefully you can understand what i am asking.
Thank You

[Enzo]

Ignore the lack of earth, but the frame of the turntable must be grounded to the frame of the amp. the shields on the signal cables is not a good ground. Even though it might seem so. Look at any DJ mixer with phono inputs, you will see a grounding post on the panel.

[trem]

OK.....10-4.....Thank You

[Mick Bailey]

The connections to the cartridge in your deck are bought directly out to the phono connections as (L&R) signal and ground. Those grounds are signal grounds only, and do not connect to the tone arm, headshell or any other metal part of the deck. This is to prevent a ground loop occurring between the deck and amp.

However, the metal parts pick up noise and this can get coupled into the sensitive cartridge. So those parts are connected to a separate chassis ground terminal. When you connect this to the ground stud on the amp you're establishing a separate chassis ground that does not form a loop with the signal grounds.

[jbltwin1]

Turntable? What's that! (Just kidding). Haven't had mine even hooked up for years. Too lazy! Mike.

[trem]

The connections to the cartridge in your deck are bought directly out to the phono connections as (L&R) signal and ground. Those grounds are signal grounds only, and do not connect to the tone arm, headshell or any other metal part of the deck. This is to prevent a ground loop occurring between the deck and amp.

However, the metal parts pick up noise and this can get coupled into the sensitive cartridge. So those parts are connected to a separate chassis ground terminal. When you connect this to the ground stud on the amp you're establishing a separate chassis ground that does not form a loop with the signal grounds.

Thank You.....i think my main problem is just that fact that my turntable is "Direct Drive" and it is on a much Smaller/Lighter piece of furniture now.
But yeah...that explains the ground ...thanks again

[Enzo]

To add to what Mick said, this is similar to in a guitar where we have a shielded wire from teh pickups, but we also need to ground the bridge and strings etc.

ANY kind of turntable needs to be grounded, belt drive, direct drive, or idler wheel drive.

[trem]

Yeah.....Thanks One More Time.
I kind of accidentally, brought up a separate issue.
I wish i had my old Belt Drive Turn Table.
Your guitar analogy kind of puts it all into place.
Thanks