Here is what I get off of the cathode of the 2nd color amp tube and a 150 ohm resistor (measured here as this resistor is soldered into a pin that is assessable from the top. Color level set to mid-point, I will assume the peak is at 3.63mc, here too the 3.08mc has a reduced response. As expected at max color level there is no signal as the pot goes to zero. Adjusting L17 only increases or decreases the overall response curve while holding the 3.63mc marker at the peak. I also tried to measure at Pin 7 of the first color amp but the signal was too low to really measure.
With the directions for L19 to minimize the 3.58mc marker I assume that leaves the earlier circuitry to provide an overall response curve wide enough to cover 3.08mc through 4.08mc. Here with the 1st color amp the center point seems like it should be shifted in frequency a bit lower.
