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关于THS3491用作驱动电路的问题

Other Parts Discussed in Thread: THS3491

如图所示,当我把Vin+与Vin-同时接地(即在没有输入的情况下),测量R39与运放输出的电压都有剧烈振荡,并且+15/-5V供电电源输出很大功率(3-4W),但运放输入电压确定为0;但若将R40取为51R,并直接将R40接地,去除后级电路,则运放输出电压为0,振荡消失,供电电源输出功率不到0.1W。请问一下这是什么原因导致的?是运放不能这么直接接推挽式功放吗?

振荡波形如图