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FDP Forum / Guitar Mods, Repairs, and Projects / Loss of treble when decreasing volume 79 Strat?

Mars Hall

USA NW Indiana

Telefunkin'
Mar 24th, 2017 10:45 PM   Edit   Profile   Print Topic   Search Topic

Recently purchased a 79 Strat. Light and resonant for a 79. However, when I roll off the volume, I lose a lot of treble. Is there a non invasive mod that will fix this?

Peegoo
Contributing Member
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The spotlight

looks like a prison break
Mar 24th, 2017 11:08 PM   Edit   Profile   Print Topic   Search Topic

Solder a small .001pf cap across the two un-grounded legs of the volume pot.

Mick Reid
Contributing Member
***

Australia

American-made in Oz!!
Mar 25th, 2017 12:49 AM   Edit   Profile   Print Topic   Search Topic

^^^^^^^^^^^^^^^^
What Peegoo said, EXCEPT a .001uF cap, NOT pF:

This is what's referred to as a "treble bleed".

If you do a web search of "treble bleed mod" or "treble bleed circuit" you'll come up with heaps of variations of that theme, but they all essentially accomplish the same thing and it comes down to personal preference.

The simplest, most straight forward method is the suggestion above using .001uF capacitor.
This has become my go-to method.

Mars Hall

USA NW Indiana

Telefunkin'
Mar 25th, 2017 02:07 AM   Edit   Profile   Print Topic   Search Topic

Thank You!

DrKev
Contributing Member
*****

Paris, France

It's just a guitar, not rocket science.
Mar 25th, 2017 02:29 AM   Edit   Profile   Print Topic   Search Topic

Cap across the volume pot is good. Cap and resistor often better, though it's all down to your ears at the end of the day. But the problem itself it's caused by cable capacitance and input impedance of the first pedal or amp you are plugged into. Long cables and/or vintage pedal circuits make it worse, so try shorter cable too. If all your pedal are true bypass, your cable lengths all act like one big one so keep everything short as you can.

I have a round up of of the various manufacturers recommendations for capacitor and resistor values, with notes, here...

DrKev's Treble Bleed Mod round up.

(This message was last edited by DrKev at 04:36 AM, Mar 25th, 2017)

Peegoo
Contributing Member
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The spotlight

looks like a prison break
Mar 25th, 2017 07:09 AM   Edit   Profile   Print Topic   Search Topic

Don't listen to Peegoo. Listen to Mick.

He wuz RIGHT!

(This message was last edited by Peegoo at 09:10 AM, Mar 25th, 2017)

Mars Hall

USA NW Indiana

Telefunkin'
Mar 25th, 2017 03:55 PM   Edit   Profile   Print Topic   Search Topic

Thank you DrKev! I do use a long (curly) cable but had the same issue with a 10' straight into the amp. I have an array of caps and resistors, I'll take a few hours and do some experiments soon. Thanks again to everyone.


Mick Reid
Contributing Member
***

Australia

American-made in Oz!!
Mar 25th, 2017 04:02 PM   Edit   Profile   Print Topic   Search Topic

HAH! Mark the calendar! First time for everything...

Thing is, I wouldn't have known the difference if I hadn't been edu-ma-cated here at FDP University.

I owe it all to yous who came before me...


Steve Dallman
Contributing Member
**********

Merrill, Wisconsin

Age is just a number...mine is big
Mar 26th, 2017 10:13 AM   Edit   Profile   Print Topic   Search Topic

.001uF is too big for my tastes. I start with 250pF and adjust up or down to taste.

DrKev
Contributing Member
*****

Paris, France

It's just a guitar, not rocket science.
Mar 26th, 2017 11:48 AM   Edit   Profile   Print Topic   Search Topic

Yes, PRS use 180 pF = 0.00018 µF = 0.18 nF

Would be much easier if everybody just used nF. Tone capacitors are usually 22 nF or 47 nF, and treble bleed caps are usually 1 nF or smaller.

amphead4

Cincinnati, USA

Mar 31st, 2017 06:55 AM   Edit   Profile   Print Topic   Search Topic

"Would be much easier if everybody just used nF."

Probably but old habits die hard.

Te 52

Laws of Physics

strictly enforced
Mar 31st, 2017 10:26 AM   Edit   Profile   Print Topic   Search Topic

"...Would be much easier if everybody just used nF..."

Might be even easier if everyone used picofarads, since the value printed on a small cap gives its value in picofarads. Code 223, for example, means 22 followed by three zeros or 22,000 picofarads.

DrKev
Contributing Member
*****

Paris, France

It's just a guitar, not rocket science.
Apr 1st, 2017 12:38 AM   Edit   Profile   Print Topic   Search Topic

True dat!

FDP Forum / Guitar Mods, Repairs, and Projects / Loss of treble when decreasing volume 79 Strat?




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