The OEC 9800 features a rotating anode tube. By rotating the anode, this tube type disperses the heat created by generating X-ray evenly around the circumference of the entire anode, allowing the C-arm to take longer exposures at higher doses. If you intend to work with a high volume of patients or to specialize in applications like vascular or bariatrics where the power demands will be higher, a rotating anode is a must.
The OEC 8800 has a stationary anode. All of the heat coming from the cathode lands on the same portion of the anode surface. If used too hard, this can lead to a decline in tube efficiency and eventual failure much sooner than a user might experience with a rotating anode tube. That siad, this tube style works just fine for shorter, low-dose studies. It is also less expensive and smaller, allowing the 8800 to have a smaller footprint overall. If your specialty is more along the lines of sports medicine or pain management, a stationary anode will be sufficient for your needs.
Watch the clip below to see an image comparison test of the OEC 9800 rotating anode tube vs. the OEC 8800 stationary anode tube taking short exposures.