Sorry to do this, but I'm still new to building.
So far I've been very conservative in my approach, so in my preamps I have been using 100K anode loads, 1.5K cathode resistors and 22uF cathode caps. 12AX7s and HT values in the region of 325 to 360V. Nothing ground breaking but it works, and so far everything has been usable and sounds passable.
Now I know that changing the value of those caps will change the response of the stage, but I was curious as to how much of a cap value change would be needed for a noticable difference?
What I mean is suppose I have a 22uF cap on a stage and I decide I want it more bassy. I could put a 47uF cap in parralel to give 69uF, but how much difference is that in the real world?
Is it something detectable, but only by men in white coats in labs with specialist measuring equipment? Or by an experienced musician with a trained ear? Or would the difference be so massive anybody would notice instantly?
Likewise if I swap the 22uF with a 4.7uF, I know the stage emphasises more treble, but would I need ro be looking at 0.47uF for it to be noticable? Or would 10uF be enough? Or would only bats notice the difference?
I know the best way is to experiment and listen, and believe me I will be doing so, but before I do, I would like a clue as to what I should be experimenting with to get a difference that can be "heard", not just "measured".
I did try looking up some bass amp schematics on the web to see if they could give me a clue,but the only ones I could find to my surprise all used 22uF caps on preamp cathodes, so I am now totally confused as to the effectiveness of changing the cathode cap value to alter frequency response.
Sorry again for a post that may seem like repetition to some!!
So far I've been very conservative in my approach, so in my preamps I have been using 100K anode loads, 1.5K cathode resistors and 22uF cathode caps. 12AX7s and HT values in the region of 325 to 360V. Nothing ground breaking but it works, and so far everything has been usable and sounds passable.
Now I know that changing the value of those caps will change the response of the stage, but I was curious as to how much of a cap value change would be needed for a noticable difference?
What I mean is suppose I have a 22uF cap on a stage and I decide I want it more bassy. I could put a 47uF cap in parralel to give 69uF, but how much difference is that in the real world?
Is it something detectable, but only by men in white coats in labs with specialist measuring equipment? Or by an experienced musician with a trained ear? Or would the difference be so massive anybody would notice instantly?
Likewise if I swap the 22uF with a 4.7uF, I know the stage emphasises more treble, but would I need ro be looking at 0.47uF for it to be noticable? Or would 10uF be enough? Or would only bats notice the difference?
I know the best way is to experiment and listen, and believe me I will be doing so, but before I do, I would like a clue as to what I should be experimenting with to get a difference that can be "heard", not just "measured".
I did try looking up some bass amp schematics on the web to see if they could give me a clue,but the only ones I could find to my surprise all used 22uF caps on preamp cathodes, so I am now totally confused as to the effectiveness of changing the cathode cap value to alter frequency response.
Sorry again for a post that may seem like repetition to some!!
Comment