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Circuit Board for the 09/1995-05/31/1997 SUNDANCE® 600 and 650 Systems. Choose Pal Chip Revision from the drop-down below. 6600-053, 6600-055. NOTE: This board replaced part# 6600-053 and 6600-033. Modification of the heater relays is required when updating to new style board. Call for instructions. This board also retrofits 1995 400 series hot tubs with Pal chip revisions DPX 1.1 Rev. A, DPX 2.1 Rev. A, DPX 1.2 Rev. A, and DPX 2.2 Rev. A.