1) The banded end of the diodes point away from the Tx. You are correct.2) The Solens will NOT work. The voltage rating is fine but the capacitance is much too low. The schematic specified 7500uF (microfarads or 7.5mF millifarads.) The Solens are 12uF or 0.012mF. I did post a question for T about your caps, and I think you mught come out ahead. I'm thinking of running a 10,000uF (10mF) cap in parallel with the cap that is closer to the diodes. If T confirms, this will really help ripple.....Colin