deltafred wrote:OMG?
You mean OMG mode?
He doesn't want to cut treble.
osmar oliveira wrote:I wonder if there are any mods to its preamp to give it more bass, without taming the highs, which I enjoy.
Ken...
Moderator: Paul Gagon
deltafred wrote:OMG?
osmar oliveira wrote:I wonder if there are any mods to its preamp to give it more bass, without taming the highs, which I enjoy.
Paul Gagon wrote:If you look at the first plot from this post, you will see the frequency response of an L-1500 pickup unloaded (7.5 KHz). That same pickup, and yours as well, would drop to around 7 KHz when connected to a 1.1 preamp. This is because of the additional capacitance that the preamp and bass wiring would place across the pickup. So imagine that same frequency plot shifted down from 7.5 KHz to 7 KHz.
The Low Cut (Bass Control) is a simple High Pass type filter that rolls off low frequencies when you turn the Bass control down (Counter Clockwise). What low frequencies you ask? Well.....let's look at the circuit and see. With the .0022uf capacitor across the 1meg pot that feeds into a 250K pot (The Volume Control) you get a frequency corner of around 290 Hz. So what this means is that with your Bass Control all the way down (.0022uf cap into a 250K pot) you have a 3dB drop in signal level at 290 Hz. For every octave below 290 Hz you get an additional 3dB drop. So essentially you have 3dB drop at 290 Hz, a 6dB drop at 145 Hz, a 9dB drop at 72 Hz, and a 12dB drop at 36 Hz. As you turn the Bass Control up (Clockwise) you reduce this effect.
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