Hmmm, I am a bit suspicious of claiming the platter as the culprit. If it is the platter, I assume you would hear the ringing without the copper ring as well, right? More likely to be either the fault of the ring itself or interaction between the copper ring and the platter, perhaps.
I certainly did not hear any strange or unusual ringing using VPI peripheral clamp. Anyhow, I don't have copper ring to compare so I don't really know.
However, I do have TT Weight copper mat with its free 1lb (I think) center weight to go with my Classic. First of all, the TTweight, despite being a bit lighter than VPI center weight that came with peripheral ring clamp, sounds quite a bit more dynamic than VPI clamp and I prefer it. The copper mat also helps quite a bit. The sound is more full body, richer. Without teh copper mat, sounds is a bit flat, a bit drier. However, it is a bit difficult to really compare copper mat and no copper mat properly. The speed will change a bit as confirmed by Sutherland Timeline strobe. I have to adjust SDS quite a bit to get timing just right. However, the change is not big enough for say, KAB strobe disc to pick out the difference. VTA is also a bit difficult and I adjusted these by ears as much as I could, thanks to VTA tower, at least it was reproducible. If you want a bit more body, a bit more warmth and dynamic without losing any detail or if the system is a bit on the cool, analytical side, I think the copper mat/center weight can help quite a bit.
I certainly did not hear any strange or unusual ringing using VPI peripheral clamp. Anyhow, I don't have copper ring to compare so I don't really know.
However, I do have TT Weight copper mat with its free 1lb (I think) center weight to go with my Classic. First of all, the TTweight, despite being a bit lighter than VPI center weight that came with peripheral ring clamp, sounds quite a bit more dynamic than VPI clamp and I prefer it. The copper mat also helps quite a bit. The sound is more full body, richer. Without teh copper mat, sounds is a bit flat, a bit drier. However, it is a bit difficult to really compare copper mat and no copper mat properly. The speed will change a bit as confirmed by Sutherland Timeline strobe. I have to adjust SDS quite a bit to get timing just right. However, the change is not big enough for say, KAB strobe disc to pick out the difference. VTA is also a bit difficult and I adjusted these by ears as much as I could, thanks to VTA tower, at least it was reproducible. If you want a bit more body, a bit more warmth and dynamic without losing any detail or if the system is a bit on the cool, analytical side, I think the copper mat/center weight can help quite a bit.