The "a" mod was $495.00 on the Theta dealer price list of November 10, 1995. It is a significant improvement and involves a new PLL circuit and analog filter. You should probably buy a unit which is already a Va as that price may not be the same if the mod is still available. Theta also charges more if one is not the original owner, plus the shipping would be considerable. That said, I love my Va!
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