dontmindme
Creature
Why is it on these vintage receivers, the turntable has a seperate ground to the receiver but the receiver doesn't have a ground lug on the plug to the outlet?
Receiver/turntable ground
- Thread starter dontmindme
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markn2wae
Mark T N2WAE
Two different types of "ground".
The TT ground is what is known as a "signal ground" (helps to eliminate hum). :scratch2:
The other type (receiver to AC ground) is known as a "safety ground" to prevent possible electrocution if the AC line contacts the receiver chassis. :nono:
Mark T.
The TT ground is what is known as a "signal ground" (helps to eliminate hum). :scratch2:
The other type (receiver to AC ground) is known as a "safety ground" to prevent possible electrocution if the AC line contacts the receiver chassis. :nono:
Mark T.
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It used to concern me that my vintage equipment uses non-polarized non-grounded AC plugs. I worried that a short could develop inside the receiver or inside any component, which would put the metal chassis at 120 VAC. Some people deal with this by adding grounded power cords with the ground wires connected to the chassis, but often that introduces hum problems. The simple solution from a safety standpoint is to power the equipment from a GFCI protected circuit. This may not be as foolproof from a safety standpoint as a ground connection, but it is a large improvement compared to not using a GFCI.
By the way, the audio interconnects are usually not connected to the chassis. If you look closely you will see that the outer conductor of RCA sockets are insulated from the equipment chassis. Each chassis in your system is more or less independently floating.
By the way, the audio interconnects are usually not connected to the chassis. If you look closely you will see that the outer conductor of RCA sockets are insulated from the equipment chassis. Each chassis in your system is more or less independently floating.
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dontmindme
Creature
The TT ground is what is known as a "signal ground" (helps to eliminate hum). :scratch2:
The other type (receiver to AC ground) is known as a "safety ground" to prevent possible electrocution if the AC line contacts the receiver chassis. :nono:
Mark T.
Thanks! All great information. So it sounds like it's really two different grounds accomplishing two different things. I was just assuming all the grounds should be connected just like in wiring a house.....
Thanks again guys!
