DS3800HPBC PARALLEL LINE BUFFER CARD is available online at The Phoenix Controls. Global Shipping. Genuine Turbine Spares. Buy Now DS3800HPBC. We have a sizable inventory of spare turbine controllers that have been used and rebuilt. All circuit boards and spare components can be delivered right away to any country in the world. GE Speedtronic Mark I and Mark II, GE Speedtronic Mark IV, GE Speedtronic Mark V, GE Speedtronic Mark VI, and GE Speedtronic Mark VIe are among the products we specialize in supplying.