> One of the parts was devastatingly expensive to substitute. It was a very low noise JFET which was being used as a high impedance amplifier buffer. We had to

> One of the parts was devastatingly expensive to substitute. It was a very low noise JFET which was being used as a high impedance amplifier buffer. We had to evaluate ten different parts from other manufacturers then hand select a suitable part with the right curve and noise figure parameters. This is relatable even to hobbyist electronics tinkerers, at least to those dabbling in low-noise measurements.