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Why loading a guitar pickup loose high frequencies
Why loading a guitar pickup loose high frequencies
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Old 15th October 2021, 11:29 PM   #11
steveu is offline steveu  United States
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Guitar pickups have massive inductance but others including the Rhodes piano are worse with many coils in series. The inductance is so high that the impedance of the guitar cable produces a noticeable effect. This is why Les Paul made Low-Z instruments.
GIBSON Les Paul: Low-Impedance Series electric guitars

Unused inputs should short themselves and loading a pickup is not going to improve the s/n. This is an advantage of valve amplifiers that is rarely discussed, but can be achieved in solid state amps if the issue is well understood. A input bootstrap circuit produces a hi-Z input and may add some 2nd order harmonics.

Last edited by steveu; 15th October 2021 at 11:37 PM.
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Old 16th October 2021, 12:23 AM   #12
bucks bunny is offline bucks bunny  Germany
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Burns/UK built some low impedance guitars as well
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Old 16th October 2021, 06:30 PM   #13
gab far is offline gab far
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Hi Steveu, you say "loading a pickup is not going to improve the s/n." I'm not sure about this. If you model the pickup as an inductor and resistor in series, it has limited ability to shunt induced EMF noise voltage from the environment to ground, because of its inductance. Seems to me an added shunt resistor can help to ground out some noise, especially at high frequencies.
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Old 19th October 2021, 11:28 PM   #14
Terry Demol is offline Terry Demol  Australia
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Quote:
Originally Posted by egellings View Post
Buffer the pickup at the guitar, if possible.
This is the best approach.

However just buffering the high Z guitar pickup in guitar is no ticket to great sound. Every single high Z pickup want's to see a C + R loading to finely tune
it's response and feel. There is a sweet spot or to be more accurate, many sweet spots and conversely many loadings that don't sound particularly good.

For example you can get a very high OP humbucker to sound very bright but it will definitely not sound very good.

TCD
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Old 20th October 2021, 12:31 AM   #15
gab far is offline gab far
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Quote:
However just buffering the high Z guitar pickup in guitar is no ticket to great sound.

Yes, especially the capactor connected to the tone knob on the guitar. It forms a resonant circuit with the inductance of the pickup, and when the tone control pot is turned to a low resistance can give a pretty distinct voicing.
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