It’s not grounded. The base is purely a weight for balance and convenience. It’s overpriced considering you can buy the brush itself for quite cheap and mount it on your own arm. But I’m not sure if the cheap brush is actually the same (Thunderon) material or not. The ads say it is.
The brush needs to be mounted on a swinging arm while the record plays because the record picks up static very quickly as it spins. I’ve tested this and the static comes back in less than a minute if you remove the arm. It needs to be positioned precisely 1-2 mm above the vinyl surface to work correctly. Although it’s expensive, the SK-Filter set-up works and it’s quite sturdy. Now that I’ve got it, I wouldn’t want to be without it.
The brush needs to be mounted on a swinging arm while the record plays because the record picks up static very quickly as it spins. I’ve tested this and the static comes back in less than a minute if you remove the arm. It needs to be positioned precisely 1-2 mm above the vinyl surface to work correctly. Although it’s expensive, the SK-Filter set-up works and it’s quite sturdy. Now that I’ve got it, I wouldn’t want to be without it.