I recently received a used Spector Ethos 4 in a trade. I was told it had some noise and grounding issues. This one is equipped with an Aguilar AGP and HCJ pickups with an Aguilar OBP-2 preamp.
First thing I did was pull a schematic and compare. Everything seemed to be wired correctly. After some troubleshooting, I came to the conclusion the preamp is bad. Since I purchased this bass used, I didnt even try to make a warranty claim.
Ordered an Audere Classic preamp with Vol - Bal - Treb - Bass.
Shielded all the cavities, installed preamp, and its silent now!
I am not a spector purist by any means, this preamp sounds great with the Aguilar pickups.
Ive read a few folks are having issues with their Aguilar electronics in their Spectors. Shame that basses at this price point are having issues with quality products from Aguilar.

First thing I did was pull a schematic and compare. Everything seemed to be wired correctly. After some troubleshooting, I came to the conclusion the preamp is bad. Since I purchased this bass used, I didnt even try to make a warranty claim.
Ordered an Audere Classic preamp with Vol - Bal - Treb - Bass.
Shielded all the cavities, installed preamp, and its silent now!
I am not a spector purist by any means, this preamp sounds great with the Aguilar pickups.
Ive read a few folks are having issues with their Aguilar electronics in their Spectors. Shame that basses at this price point are having issues with quality products from Aguilar.

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