Is the Kab Speedstrobe necessary with the VPI SDS?

Paul. When I enquired with VPI that I could not get my VPI strobe disc to work, they casually stated that it won't work on 50hz and to buy the KAB disc and strobe.

I guess that is an option or sorts :)

I went ahead and ordered the Kab Speedstrobe even though I had the strobe disc that was supplied with the SDS. Before the KAB arrived I thought I had my Scoutmaster platter speed set exactly at 33 and 1/3 but the KAB showed that the speed was fast by .07 on the SDS. So I'm glad I ordered the KAB, it's make's speed adjustment more accurate, plus easier and faster to dial in than the strobe disc that came equipped with the SDS.

I think you just answered your question Lornoah. LOL