Thomasdj
Member level 5
tube amp negative feedback
Hi Frank!
I wrote it wrong, the FET is connected at the mute buss at the "CH MSTR WIPERS" FET drain. I may have got this part of the schematic wrong. I've used six FETs (three FETs for the mute circuit in switching part schematic, and three FETs for the preamp pt2 and pt3) which could be only three FETs drawed two times in the schematic.
However, I measured the voltage at the gate of the FET in present and it shows 0v! Here is clearly a problem and I'll check if I've got the pin connections wrong. I've tried a lot of FETs with different brand so this could properly be the reason.
But, what do you think - is it three FETs drawed two times or six FET's? and would it matter?
Thanks
Thomas
Hi Frank!
I wrote it wrong, the FET is connected at the mute buss at the "CH MSTR WIPERS" FET drain. I may have got this part of the schematic wrong. I've used six FETs (three FETs for the mute circuit in switching part schematic, and three FETs for the preamp pt2 and pt3) which could be only three FETs drawed two times in the schematic.
However, I measured the voltage at the gate of the FET in present and it shows 0v! Here is clearly a problem and I'll check if I've got the pin connections wrong. I've tried a lot of FETs with different brand so this could properly be the reason.
But, what do you think - is it three FETs drawed two times or six FET's? and would it matter?
Thanks
Thomas