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Old 17th April 2020, 08:48 PM   #1
amandarae is offline amandarae  United States
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Default Naksa 80 Input GND question?

Hi,
Inside of the amp

Click the image to open in full size.

I have a green wire connected to the central earth ground at one end and not connected to anything at the other end.

Click the image to open in full size.

Looking at the inputs connection to the board, Hot and Gnd seems to be correct.

Click the image to open in full size.

Per manual, the wire (pointed) label per manual says "RCA Ground to Star Earth PCB"

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Should I connect the green wire to the GND of the L and R input RCA's then? I do have some hum (one source, one preamp, 94 dB speakers). Other amplifiers does not exhibit the hum.

Thanks for any help.
Abe
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Old 17th April 2020, 09:44 PM   #2
AKSA is offline AKSA  Australia
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No, Abe, the green wire is to IEC earth and should be connected to the center spade at the midpoint of the pcb in the middle of the block of filter caps.

However, since you may have acquired a used NAKSA it may not have connected because the previous user found it was quieter when he floated the amp. Floating the amp means that the chassis/IEC earth is not connected to the central power earth on the pcb. This is just fine electrically because the amp is isolated galvanically from the mains with a transformer. Some times connecting amp power amp to chassis/IEC earth can bring hum to the speakers because the earth of the house wiring is very noisy.

Enjoy your NAKSA!

Hugh
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Old 17th April 2020, 10:13 PM   #3
amandarae is offline amandarae  United States
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Quote:
Originally Posted by AKSA View Post
Floating the amp means that the chassis/IEC earth is not connected to the central power earth on the pcb.

Enjoy your NAKSA!

Hugh
Thank you Hugh!
I acquired this amp three years ago.
Yes, that seems to be the case here.

Click the image to open in full size.
I will try hooking the green wire to IEC ground and see if it makes a difference.
Abe
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