The Traveler, and the Classic 1 now have an additional circuit board in them that does essentially what the SDS does...it creates a much better power source for the motor. There are no adjustments, but the tables have improved performance. Harry is always making his stuff better.
My dealer tells me that both the Classic and Traveler have a built in circuit that is similar to the standalone SDS but without about ability to vary the frequency nor does it step down the power once the table is up to speed.
If the motor can maintain speed at either a 50 or 60hz without a change in pulley, the circuit must be doing some form of power regeneration to a 60hz frequency.
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