Before free_electron & I had our little disagreement,he,& others, had made the points that:
(1) Two Op Amps operating at 10MHz.& around one inch apart,one driving the other, do not need to be terminated in 50 Ohms(or any other specific value of resistance).
(2)Until the distance between them reaches approx 1/10 wavelength,( in this case 1/10 of the wavelength of a 10MHz signal is 3 metres in free space,a bit less in a transmission line) ,the connections do not constitute a transmission line.
(3)The output impedance of an Op Amp in many cases is very low,so that if a 50 Ohm resistor is connected in line with the output,the apparent output impedance to any circuit driven from that point becomes so close to 50 Ohms that the difference may be ignored.
I think that (3) is the "sticking point" for Mechatrommer,in that it is difficult to visualise an amplifier with nearly zero Ohms output impedance.
I had the same problem,many years ago,when I was first introduced to Video Amplifiers,with their 75 Ohm output impedance.
Here is a link to a site with practical schematics of Video Amplifiers which use the technique in (3).
http://cds.linear.com/docs/Application%20Note/an57fa.pdfThese are 75 Ohm devices,but the concept is the same.