Great post by Jonesy on MLP on Capacitors. Definately worth the read!

Myths about Capacitors

There seems to be a lot of Myths about Capacitors from many of the posts I have read here at MLPF and on other forums. I am going to try and set the record straight from what I know and from what I have experienced over the years...please feel free to correct me if you think I am wrong.

Myth #1 Will Lower value capacitors make my guitar brighter?

No, capacitors only filter highs off when you turn your Tone control. They do not make your guitar brighter when wired up to a Tone pot in standard fashion. (may be some slight bleed if you do not have a no load pot) If a capacitor is wired in series or in a treble bleed circuit (RC circuit) it can act differently and let highs come across, but this is not the case when wired to your Tone controls. With new good quality caps you may here less mud and more clarity once installed, but they are used to filter high frequencies when they are wired up in a Tone circuit.

Even though .022 has been the standard for Gibson .015 and .010 are the choice by many players seeking good Tone and more useful room on their Tone dials.

Myth #2 Do paper in oil capacitors dry out and need to be replaced frequently?

No, when used in a guitar circuit paper in oil capacitors will last a lifetime. There are plenty of 50-60+ year Old Bumble Bees caps that still sound excellent. If they have been used in high voltage applications like amps etc. that may cause them to drift away from the original specs, but when used in a guitar this is not the case.

Myth #3 Do all capacitors sound the same and there is no way that one type can make your guitar Tone sound better?

Many electronic experts will tell you that there is no scientific explanation of why paper in oil capacitors will give you better Tone when used in a guitar circuit. But it is a well known fact in the guitar community that paper in oil will be warmer, smoother and have more "Sparkle" than ceramic disc, mylar or polypropylene capacitors. The original Bumble Bees and Black Beauties were paper in oil and thought of by many to be the "Holy Grail" of Tone as far as capacitors go.

Myth #4 Does it matter which end of my capacitor I wire up to what, is there a polarity?

No, for the most part 99% of the capacitors I have come across are not polarized and it makes no difference in which direction they are wired up in your guitar. There are some caps that do have a + - side and they will usually be marked accordingly or the manufacture will tell you that it matters.

Myth #5 R9's Come with Real Bumble Bee Capacitors so there is no need for me to replace them, so why should I?

No, your R9 came with "Fake" Bumble Bee caps that contain a cheap little poly film capacitor buried on the inside of the pretty little plastic black case with stripes. Gibson does not use Real Bumble Bee caps in their reissues, and they are not even paper in oil capacitors. Luxe Bees are actually Russian K40y-9 paper in oil caps and have a very similar Tone to the Original Bees.

Myth #6 Jonesy's Tonemojo capacitors have some secret "MOJO" in them that is rumored to have been extracted from Robert Johsons sweat and mixed up with some crossroads dirt that will make you sound like Clapton, Hendrix and Jimmy Page all rolled into one.

No, not true. The only thing special about my paper in oil capacitors is that they are good quality paper in oil capacitotrs with metal cases, and glass sealed ends and are either New Old Stock USA or Russian caps or the 50's Bees that are good quality pulls that have been measured on my bench meter.

I hope's this clears up a few things and if anyone has any other Myths or questions I would really like to hear them?

Keep the music flowing...
thanks, jonesy

Once again, great post! Thanks Jonesy!!!

Check out Jonesy's pre-wired kits, Jimmy-Page switching and more on TONEMOJO