Paul, no plates in the column atop the 150 gal. spirit still., just a dephlegmator. Next column consists of 11 bubble plates with a drainback,( to the still), pot at the base. Third column consists of 8 bubble plates with a drainback ,( to the still), pot at the base and a dephiegmator at the top. Last column is only the condenser and parrot. We by pass the bubble plate columns,(2 & 3) when making whisky. Through the columns (with 25% low wines in the still) we are barely getting 91-94%ABV. Any suggestions. Thanks Jim