I am trying to build a simple subtraction amp like figure 45 of the LM318 data sheet. attached (I think). I need to subtract 2 sine wave signals both of which are 6.78 MHz. I have bypassing on the power supply, and the amp oscillates and is not stable at somewhat low frequencies, like less than 1 MHz. I am building this on a solid ground plane and care has been taken to be sure all wires are short. my resistors have very short leads. everything is built close to the copper ground plane.
I would be willing to use another op-amp, if there is a better, easier to use amp which maintains stability.
thanks
shown lm318 diff amp.pdf