nick So I have a modified Tubescreamer (TS9), which I love. My only gripe at the moment is I recall swopping out some component for that of a different value to allow more bass through but now I find myself pushing the tone to get more treble through. Looking to fiddle with the values a bit to try get it more balanced so I have more room for adjustment, anyone know which component to change? I modded it quite a while ago and have since lost the notes I made.. ☹
nick Found this: More bass - remember that 4.7K/0.047uF network on the (-) input of the clipping amp? To give yourself more bass, increase that cap to about 0.1uF. The (-) input is pin 2. My TS9 internals after fiddling
Shibbibilybob So it looks like the green film cap at pin 2 of your op-amp is the one being referred to. Have you already changed it to a 0.1uf cap? if so, perhaps try some value between the 47pf and 0.1uf ? That should give you some nice middle ground? Or have I misunderstood?
mtmattan To allow more bass through, you would have done 1 of 2 modifications: 1. Change the input cap - stock = 20-27nf. Bass = 47-100nF. This adjusts the bass going into the circuit. 27nF stock cuts a lot of bass frequencies. 2. Change the cap from the feedback loop of the op amp - this is the cap at pin 2 of the op amp. Stock = 47nF. Bass = 100nF. Whats the difference between 1 and 2? Not much! One controls the bass entering the circuit at the input buffer, 2 controls the bass of the next stage. Also note, tone controls and coupling caps (what you modded) are similar but can be like Apples and Oranges. Input/Feedback caps control the overall "boominess" vs "tightness". A tone control selectively cuts certain frequencies. So yes, turning the knob clockwise will get up the treble but the bass is dependant on what has actually entered the circuit first. Getting back to the question, turn the board around and see what cap looks like it was soldered in last. It should be visible easily. Then if it's one of the bass listed values, youre on the right track. Matt.
