Kindablue wrote: ↑Sun Aug 22, 2021 2:56 amBut shouldn't I be able to measure resistances between the pot and the 10m resistor and between the pot and the 56k resistor? Looks like it should be 3.5k between the 1pm and 6.8 k between the 56k and the pot? Am I confusing something? Is this a measurement I should strive for after starting with the pot in the middle?
The resistances are immaterial.The trimmer is there to compensate for the non-linear transfer characteristic, which varies from one tube to the next.
Kindablue wrote: ↑Sun Aug 22, 2021 2:56 amIf doing it by ear, what are you listening for exactly...bloom? Just where it sounds best in general...and at what volume/gain?
Unless you want to make measurements with a scope, just set it where it sounds best to your ears at the volume that you will be playing it.
Kindablue wrote: ↑Sun Aug 22, 2021 2:58 amI've also heard some folks were using a 5k 5watt resistor in place of the 4.7k dropping resistor?
5k vs. 4k7 will make little difference in voltages, but a 5W wirewound cement resistor will have lower noise and lower surface temperature in use.
