rotery for neons (whats a sink rotery)

What is a sink rotery? And I have the two 9Kv 30mA, and one 12K 30ma,
which one would be better, the 9K's?
> Phillip,
> I've been using sync rotaries with NST's for some time now.  I find 
> they give a very smooth and efficient result.  Using a 12kV, 30ma
> NST, I get 42" sparks.  Using a 15kV, 60ma, I get 64" sparks.
> Much has to be optimized to get these results, toroid size,
> cap size, etc.  I've posted the specs for these coils numerous
> times in the past.  I have video tapes available that show the
> construction and operation of these coils.   The rotary should be
> a sync rotary because regular rotaries tend to destroy the NST's.
> John Freau

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