BSIAB2 Another Build Report

[rasco22862]

Hello guys! It´s been a while since my last build. Now that i get the 2n5457 and j201 i build a BSIAB2.
It´s Gaussmarkov layout. I have a couple of questions altough. First, when biasing Q3 i couldn´t hear any difference in a certain range of the trimpot, so i just leave it in 4.11V Second, if the Gain pot is all the way down i have no output. I have to raise it a little bit to start getting output. And third, there´s a lot of Gain yet in the minimium Gain settings (when i  have output) so I have to control the amount of gain with the Guitar volume knob.

Here are the voltages:

Q1
D:9.09V
S:5.05V
G:4.36V

Q2
D:9.09V
S:4.6V
G:4.3V

Q3
D:4.11V
S:0.571V
G:0V

Q4
D:5.05V
S:0.329V
G:0V

Q5
D:4.6V
S:39.9mV
G:0V

[Ice-9]

Yeah that how its meant to be, if you want some output when gain is at zero then remove the pot connection that goes to ground and stick in a 10k resistor between the pot and ground connection. experiment with the resistor size, smaller will give less minimum volume but this resistor whatever size doesn't affect max gain .

[rasco22862]

I forgot to mention that i used a 470pF cap in series with a 560pF cap for the 250pF.

[Ice-9]

I forgot to mention that i used a 470pF cap in series with a 560pF cap for the 250pF.

That would be fine, that works out at 255p and a tiny bit. This cap at the input makes little or no diffeece to my ears, and no differece in the slightest to how the gain pot works.

[rasco22862]

Thanks. Are the voltages ok? And how can I lower the general gain to have a more gentle sweep with the gain pot?