WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
Can anyone verify this math? If I'm looking at a log scale .02, .2, 2, 20, 200 on my amp's watt meter: The location of 100, starting with a datum of 2, would be log(100)-log(2) = 1.7 or roughly 2/3 between 2 and 200.... yes?
If we take the logs of 2, 20, 200 we get their linear position on the scale: Log2 = 0.3 Log20 = 1.3 Log200 = 2.3 So 20 is half way between 2 and 200, as expected. Now Log100 = 2 So the position for 100 on the scale as a fraction of the distance between 2 and 200 is (2-0.3)/(2.3-0.3) = 0.85