I have installed a trimmer and I have found out that with adding a 270Kohm resistor to the existing 100Kohm resistor (370Kohm in total) , the gain potentiometer works in full range :) thanks for pointing this out Richard :)
Ken suggested that the previous range was "normal" behavior; I have just build it and I have not spent enough time experimenting so I can not understand quite well why.
I am pretty sure Ken knows what he is talking about, since he is the "father" of our modules ;)
I am wondering what provides better functionality, leave it unmodified as Ken suggests or add 270Kohm resistor?
About the light hum I am experiencing, i have installed shielded cables to the inputs but nothing changed. the hum is audible only when increasing the gain control. Could it be that the hum is the regular noisefloor resulting by tube's operation? It is my first "tube" project , so I dont know what kind of behavior to expect.
Gentlemen, thank you all for your time and your help, I deeply appreciate it.
Ken suggested that the previous range was "normal" behavior; I have just build it and I have not spent enough time experimenting so I can not understand quite well why.
I am pretty sure Ken knows what he is talking about, since he is the "father" of our modules ;)
I am wondering what provides better functionality, leave it unmodified as Ken suggests or add 270Kohm resistor?
About the light hum I am experiencing, i have installed shielded cables to the inputs but nothing changed. the hum is audible only when increasing the gain control. Could it be that the hum is the regular noisefloor resulting by tube's operation? It is my first "tube" project , so I dont know what kind of behavior to expect.
Gentlemen, thank you all for your time and your help, I deeply appreciate it.