A question about L-2000 pre-amp (treble sweep).

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Re: A question about L-2000 pre-amp (treble sweep).

Postby GeorgeB » Sat Aug 30, 2014 3:12 am

Frequency response of a single L2K pickup with treble control (250k+47nF, 250k VolPot), series vs. parallel
L2K_TrebleControl_Ser_vs_Par.gif
L2K_TrebleControl_Ser_vs_Par.gif (21.71 KiB) Viewed 1830 times

Parallel shows:
- higher corner frequency (less perceived effect in general)
- more compressed control range (less perceived effect vs rotation)
- higher peaking (more "honky" sounding when fully dimmed)

With both pickups selected the effects are even more severe.
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Re: A question about L-2000 pre-amp (treble sweep).

Postby Stevedude » Sat Aug 30, 2014 6:17 am

Thank you so much for your technical input George.
As you mentioned, the limited and very uneven treble range is more noticeable when both PUPs are selected. :o

Steve
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Re: A question about L-2000 pre-amp (treble sweep).

Postby Stevedude » Sat Aug 30, 2014 10:33 am

An update, and a decision.

Update:
Ken notified me that the 10K resister might be on circuit board, labeled as R11 instead of being attached to the wire and switch terminal as shown in the diagram.
Checked my circuit board, and It was there on the circuit board as R11.
So I guess that 10K register is on the actual board now.
I am sooooo glad that no component is missing and there's no issue in wiring.

Decision:
After seeing George's posting, I double checked and listened my bass carefully.
As he mentioned, the limited/uneven sweep range of treble is MUCH more severe when both PUPs are selected.
But either neck or bridge PUP being singled, the sweep is there at more noticeable level.
Not as much of range in change as can be heard in series mode, but it's there if I listen carefully when single PUP is selected.

So---, I am thinking that If I need to adjust treble tone when using both PUPs in parallel mode, I will just use my amp's EQ.

And, I am inclined not to seek for warranty repair since especially no component is missing and wiring is correct.

Thank you SO much Ken and George for everything.

Steve :)
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Re: A question about L-2000 pre-amp (treble sweep).

Postby Youngspanion » Sat Aug 30, 2014 1:22 pm

Stevedude. It seems to me that you have a very sensitive ear. According to George, that frequency response is not unique to your bass but it is to your ear.
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Re: A question about L-2000 pre-amp (treble sweep).

Postby Stevedude » Sat Aug 30, 2014 2:13 pm

Youngspanion wrote:Stevedude. It seems to me that you have a very sensitive ear. According to George, that frequency response is not unique to your bass but it is to your ear.

That may be. I may have sensitive ears but I know that I am picky when it comes to bass tone.
As I get older, my eyes are getting worse and worse. But my ears are still going strong, I think. :oops:
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Re: A question about L-2000 pre-amp (treble sweep).

Postby badgirl » Mon May 06, 2019 5:31 pm

New member here.
I just wanted to say thanks, especially to GeorgeB for the frequency response chart.
This is just the information I was looking for.
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