Found an old oscillator when cleaning out a barn. It is a model YH890-1 made by Greenray Industries. Since it is 10 mhz. output, I though it might be useful for something. It has a BNC connector which I assume is the output and three terminals on the side. One is chassis ground. The label says both the input and oven are 28 VDC, so I suppose putting 28 volts on both terminals is the normal hookup but am not sure. Does anyone have any incite about this? Thanks, Al, retired, mostly