So. I have the function generator, the oscilloscope and some OTXs (SE and Push Pull). I want to test them for frequency response. Obviously if i drive them from the 50R output of the generator at 1V I will get fantastic measurements wholly unreflective of real world conditions. So what kind of resistance should i put in series with the devices? the PP transformers are (and will be used as) ultra-linear. For the SE transformers I guess approx 800R to simulate a 300B. Any suggestions?