now it looks like noise is being introduced somewhere in the preamps, I have a parasitic ocillation on the wave form on all preamp and 5069 board, gets worse the higher the frequncey. So far been a buger to isolate. any good way to jumper past the 3 boards one at a time to find problem? I can put my scope on the input and when I turn it up just a little boom trash on top of sine wave.Hmmmm