Have you opened the amplifier cover and made sure the tubes are all seated and the plate caps are connected? At 50 watts the grid current should be over 100 mA and the plate current around 450-550 mA. On the TS-590, look at the power output while trying to drive the amplifier. It should remain at the level you previously set it to when operating in STBY. If the power output has decreased then look at the SWR function on the 590. It should be below 1.2:1 or so. If not, then you have an input problem. The setting and menu selections you have for the 590 are spot on. So, there's no problem with the 590. Hope this helps 73 Gary P.S. If you are unfamiliar with high voltage circuits then make sure you have help from someone that has and never work alone. There's a goob more to this. So, be very careful. One slip and you'd never have another bad day to worry about.