Mapman, thanks very much for performing those measurements. The HiFi Tuning paper Geoff linked to indicates that the difference in resistance between a 3.15 amp HFT fuse and a standard fuse was in the vicinity of 0.03 ohms, with the HFT’s resistance being lower. Given the somewhat limited resolution of your meter, your results appear to be similar.
So you’ve confirmed that unusually high resistance is not a contributor to the differences the SR fuses are making for many people. And neither is unusually low resistance. A 3 amp fuse in normal usage is likely to be conducting something on the order of 1 amp, which would result in a difference in voltage drop compared to a typical stock fuse of 0.03 ohms x 1 amp = 0.03 volts (corresponding very closely to measured voltage drop differences reported in the HFT paper for 3A fuses). And while 0.03 volts is almost certainly too small to make a difference in most or all applications, it is absolutely too small to make a difference that is consistently in the direction of being better, across a wide variety of components and a wide variety of AC line voltages.
So the mystery continues.
Best regards,
-- Al
P.S: David -- very sorry to hear the news about your brother. I’m sure I speak for all of us in hoping that his condition is treated successfully.