Nobelium - tube bass preamp project

@vigilante398

I thought I remembered seeing this info somewhere but I looked everywhere I could think of and didn’t see it. What frequency (roughly) does the treble control start affecting? Seems like somewhere down in the 4-5k range? Is there a spot I could try changing values to try getting that up a little higher? I find it’s just pulling a hair too much of the mids up with it. I thought if it was as easy as swapping out a resistor or two I might give it a whirl.

Thanks!
 
Creekside said:
@vigilante398

I thought I remembered seeing this info somewhere but I looked everywhere I could think of and didn’t see it. What frequency (roughly) does the treble control start affecting? Seems like somewhere down in the 4-5k range? Is there a spot I could try changing values to try getting that up a little higher? I find it’s just pulling a hair too much of the mids up with it. I thought if it was as easy as swapping out a resistor or two I might give it a whirl.

Thanks!
Click to expand...
The Noble/Nobelium uses a Fender-style tonestack with a fixed mids response. It's a shelving filter with no fixed frequencies, and the controls are very interactive.

That being said, you could try increasing the value of the 270pF cap in the tonsetack to something like 470pF or 500pF, that should tame the highs a bit.
 
Check it in the TSC calculator first so you can see whats happening, remember to leave the Mid pot on 10 as the Nobelium uses R21 instead of a Mid pot.
Just click on "Edit" and change values and then click "Apply" and then you can slide the Bass and Treble pots to see what happens, you can also change the R21 resistance but keep the "Mid" pot slider on 10 since it is a fixed resistor.
Here is the link to the TSC already set for the Nobeliums tone stack: https://www.guitarscience.net/tsc/f...C3=100n&RB_pot=LogA&RM_pot=Linear&RT_pot=LogA
 
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