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Your suggestion of swapping X and Y axis is good. I also found I used the wrong Excel chart.

Also, because the X-axis values range is too wide, I need to split the X-axis into three, to make the values more readable. Many thanks again for pointing out my newbie charting mistakes.

I have found the cause of the missing negative resistance portion in tracing the tunnel diode curve. I found that for the 2BS4 tunnel diode, there seems to be some oscillation in the 200mV to 270mV, 1.88mA range. Both causes are explained in the GE manual, as summarized below.

Ah supper time. See you later. Cheers.

Very interesting... Fig. 7.1 is exactly as the picture in my movie. Do you imagine where the load line is? Or you are waiting for Tony to explain to you what the load line is:)?

OK, I will say to you another wisdom as a reward for your curiosity. As you can see, there is no explanation about how the tunnel diode "jumps" over the negative resistance region in Fig. 7.1. (not only here but everywhere). They only say that it "jumps" but not explain how it "jumps". Here is the geometric trick.

The intersection point between two curves (the IV curve of the tunnel diode and the load line) is what is called an "operating point"...

If you look at my pictures, you will see that actually, it is an intersection point of two lines. Initially, the load line moves horizontally (translates) and the line representing the static diode resistance R stays immovable. When the intersection point reaches the peak, this line begins vigorously rotating while the load line stays immovable. So, the intersection point quickly moves (slides) along the load line... this is its trajectory..