Hiizikg wrote:Hijmwreck wrote: I am having a problem with the Drive (B3k) because I got a cutting out sound, it seems that the distortion sound will get disconnected and all that's left is the clean sound,
I also get this cutting out when at high gain , I found that high frequencies noise is amplified and causing this problem on the drive opamp.
I suspect it has something to do with the filter before that opamp , but I just can not understand it.
does any one know this filter design or can explain that I also noticed that the BDDI has a similar filter Thanks,
The first figure - R8 C8 - controls high frequencies.
1) When the switch is in the center position, the high frequencies do not change.
2) When the capacitor is connected to ground, the high frequencies are cut off, this is the classic RC-filter
3) When the capacitor connects to the resistor, this parallel RC-filter, like the Marshall, in this mode, high frequencies rise.
The second picture is Bandstop filter - the filter does not let pass a certain frequency. In this case, this filter cuts low-mid freq, the frequency of 320 HZ is cut completely and the frequencies near it are also severely cut off.